Seiko caliber 6309

Seiko Caliber 6309

Seiko caliber 6309

Brand Seiko
Caliber Number 6309, 6309A
Movement Type Automatic
Lignes
12”’
Diameter
27mm
Height
5.3mm thick
Jewels 17
Vibrations Per Hour
21,600 bph
Power Reserve 47 hours
Lift Angle
54.5 degrees (needs confirmed)
Shock System Diashock
Rotor Ball bearing
Mainspring 401615
Balance Staff 311601
Hands 1.5mm x 0.90mm x 0.20mm
Hacking? No
Manual Winding? No
Crown Location 4:00
Functions Hours, minutes, central seconds, quickset bi-lingual day, quickset date
Country of Manufacture Japan
Known Models 6309 (add more in the comments below…)

The Seiko caliber 6309 is a vintage automatic workhorse movement that was found in many Scuba Diver models, seiko 5, and dress watches in the 1980’s.

Note: This caliber is sometimes mistaken as being 6809 (6809A) by folks who can’t see the 3 clearly.

Some of the topics covered in this caliber listing:

In Seiko’s own words:

In old Seiko documentation, they refer to the 6309 as a Highly Reliable Movement:

The highly stabilized accuracy and high reliability established for the 61XX series has been incorporated into the movement.

Also mentioning easy servicing:

Disassembling and reassembling procedures and serviceability have been improved largely by:

  • Employment of a new balance hairspring holding device (aka no stud for the hairspring since it clamps directly in the terminal)
  • Decrease in number of parts from the simplification of the movement structure.
  • Decrease in number of new parts resulting from interchangeability of some parts with Cal. 61XX series.

Variations:

There are different variations of this movement, including Seiko caliber 6308A (17J), 6319A (21J), 6347A (moonphase, 23J), 6349A (23J).

Community Commentary:

In an interesting thread on the Military Watch Resource forum comparing the Seiko caliber 6309 to the ETA caliber 2824, shortwave said:

I have a 25 year old 6309 7290. It hasn’t been cleaned in at least 10 years. It advances 1 to 2 seconds in 12 days. I’ve never seen such accuracy in any manual watch. The ETA in my Marathon, gains seconds a day.

Video of Servicing:

Additional Resources:

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carls
carls
6 years ago

He tenido seikos con este calibre 6309 y son fabulosos van mas exactos y precisos que otros relojes que montan maquinas eta, sellita o unitas., son unos autenticos caballos de batalla sencillos, fiables, precisos y robustos.

Jonathan Shaw
Jonathan Shaw
6 years ago

I have just bought one of these movements in a bit of a frankenwatch, its got a really cool retro orange with green circle face, except I’m pretty sure its not the original case due to the way the case’s internal outer edge cuts off the numbers 2/4/8/9 and 10, I might even have a go at removing this part of the case to get the full face on show, it would make a desirable vintage 5 if I could sort that out, oh and sinceI got the watch it has been running fast, I’m trying to use the regulator… Read more »

Donny Boon
Donny Boon
1 year ago
Reply to  Jonathan Shaw

I’m 4 years late, but a magnetized watch will run fast. Hopefully you demagnetized it and it runs perfectly now.

Bill Rogers
Bill Rogers
11 months ago
Reply to  Donny Boon

How do you determine if it is magnetized? Mine runs a bit fast – noticeably

DAMUS
DAMUS
6 months ago
Reply to  Bill Rogers

try to move the stud , if ypu cant have stability you need revision , 5 seconds 10 is ok

DAMUS
DAMUS
6 months ago
Reply to  Jonathan Shaw

WELL GIVE A TRY, if youkeep ahving irregualr accuracy in your seikos 6XXX you need a watchmaker.

He will have to change some parts and tune it. Seikos are not know to be very precise,, read what factory says..!

schilviu
schilviu
6 years ago

I own this watch since August 1987. First time was cleaned after ten years of service. After few adjustments, accuracy reached a couple of seconds per week, amazing for an automatic, mid-to-low end, general purpose watch.

Andrew Barwell
Andrew Barwell
4 years ago
Reply to  schilviu

Mid-to-low end? Sorry, but you can’t judge the amazing qualities of the Seiko 6309 diver by using the obsolete method of trying to fit it somewhere along the very overpriced (and overhyped) Swiss watch lines. Seiko broke the mold and the Swiss have list their way regarding affordable quality (for most people.)

Julian
Julian
4 years ago
Reply to  Andrew Barwell

You are so correct!

Steven Turner
Steven Turner
3 years ago
Reply to  Andrew Barwell

indeed

schilviu
schilviu
1 year ago
Reply to  Andrew Barwell

Dear Andrew, first of all, I’m sorry for misunderstanding..! Secondly, far from me the intention to “blame” this 6309..! As I said above, the accuracy is amazing. However, the 6309 movement, having 17 jewels, cannot be compared with other SEIKO movements with 21-23, even 34 jewels, and more for Grande Seiko(30 to 56 jewels). This is the reason for which I named it as “mid-to-low end”, not regarding accuracy… My watch is a casual one(not diver), simply water resistant. Many thanks..!

Vlad
Vlad
6 years ago

Can anyone tell me if someone has the correct Lift angle for this caliber or if there are any calibers similar to this one.

VDO
VDO
6 years ago

I have a Seiko 6309-729A 150M diver. I had got it in 1988 as a gift. As a young boy I used it a lot for many years. However, it was neglected and kept in a drawer for the last 20 years as I used various other watches. As part of house cleaning, just found it. Just washed it and cleaned it myself. And it is working fine. What a sturdy movement. It has been working fine. A question – should I get it serviced? Everything seems fine. I just don’t want some service shop to messup. Thanks for answer… Read more »

Andre
Andre
4 years ago
Reply to  VDO

Yes. You should have someone perform a full service on that watch if you care about it to continue running well. After so many years, the oil dried up and actually became abrasive. So now, as the watch runs, the pivots and jewel bearings get damaged. This kind of damage cannot be repaired cheaply. There is also a possibility that the rubber gaskets (crown and back plate) will need to get replaced. There is a chance that an old leaky gasket may have caused some corrosion inside. A watchmaker should be able to check and advise in a case of… Read more »

Julian
Julian
4 years ago
Reply to  Andre

I have a couple Seikos with 6309. I took them to the service shop and the guy there told me they are not worth servicing…

Emrah
Emrah
6 years ago

I am 32 years old now and it is still on my father’s arm… I think i had opened my eyes to world with that machine… And now unfortunately, it needs a service… It is stopped in a sudden…

Andre
Andre
4 years ago
Reply to  Emrah

That’s expected on an old, never serviced watch. Just have a service performed on it by a watchmaker.

Kenny
Kenny
1 year ago
Reply to  Emrah

请问在那里可以修理呢?

Matthew
Matthew
5 years ago

Reliability? 6309-8920 blue dial with dented crown and much scratches all over the watch. 35 years old. Stopped working for about than 10 years. Inherited it from my dad. No servicing was done since manufactured. Shake it hard for a couple of minutes. It’s running like usual again. Opened up the back case, no corrosion and very minor dirt deposit on the gears. A true power horse indeed.

Patricia
Patricia
3 years ago
Reply to  Matthew

That is what I saw on Youtube, since I only JUST got my first automatic – a rare Orient, I am fascinated, and researching. How brilliant is this technology?

trackback
Seiko 6309-7290 Review - A Classic Diver From The 80s - iknowwatches.com
5 years ago

[…] 6309 designation is for a Seiko automatic movement with 17 jewels and 47 hours of power reserve. It beats at 21,600 […]

Adam Gutterman
Adam Gutterman
5 years ago

I have one of these (6309-7159) that I’m about to reset the hands on. I was thinking I should replace the gasket as well. This is my first time doing this – how would I know what size gasket to get?

Andrew Barwell
Andrew Barwell
4 years ago

The crown is at 4:00 on the 6309 divers.

Jack
Jack
4 years ago
Reply to  calibercorner

Hello, have I received a 6309 caliber for my birthday from a friend, are you running fast and can’t you slow down suggestions? Thanks for an answer

GG
GG
1 year ago
Reply to  calibercorner

The crown is at 3:00 on the 6309 classic gents versions 😉

Placide
Placide
4 years ago

Hello
I have just bought an old Seiko 5 6309-8610 watch on eBay. i hope I will find some watch professional to repair it

Eddie M.
Eddie M.
4 years ago
Reply to  Placide

What is wrong with it?

Auburn Senn
Auburn Senn
4 years ago

By far the best SEIKO movement I have ever come across. My 6309 watches are robust and accurate. I have over 50 pieces of the 6309-7040/49s and they all work perfect

Andrew Barwell
Andrew Barwell
4 years ago
Reply to  Auburn Senn

Wow, how do you rotate your to-wear cycle with that amount of watches?

rictors
rictors
4 years ago
Reply to  Andrew Barwell

that’s what i wanna know

julian
julian
4 years ago
Reply to  Auburn Senn

Over 50 pieces??? I´m so jelous!

Terrell
Terrell
4 years ago

I have a Seiko 6309-7049. It needs an overhaul and service. My local jewelry tech was of no help. Any recommendations for a vendor to service it?

Tucker
Tucker
4 years ago
Reply to  Terrell

Even though sending Seikos to their repair center in NJ gets abysmal reviews on Yelp, I had a positive experience. They repaired the movement, replaced the crystal, and cleaned the whole watch for $170. Sure I could have replaced my old chronograph for that amount, but that wasn’t the point.

Brian Horrocks
Brian Horrocks
3 years ago
Reply to  Terrell

Send your watch to Michael Swift on the Isle of Bute.I send mine there excellent ..not expensive either…see him on google.

Gary Brimble
Gary Brimble
3 years ago
Reply to  Brian Horrocks

I didn’t know he was still going, did a great job on one of my watches, recommended.

Julian Rafalko
Julian Rafalko
4 years ago

I have a couple 6309 that have never been serviced. They work fine except they just charge the power reserve for about five hours. I took them to be serviced (they only need to get cleaned and oiled) but the watch repair guy (althouhg he admits the 6309 is a workhorse movement) refuses to service them. He claims it is cheaper to buy them on line than servicing them… I´m NOT happy!

trackback
Seiko Caliber 6308A Watch Movement | Caliber Corner
4 years ago

[…] caliber 6308A is based on the Seiko caliber 6309A. The main difference between these two movements is that the 6309A has a day/date complication at […]

MIke S.
MIke S.
4 years ago

I had a 6309 bought at my ships store in 1986 and 87. Actually had two of them from the same ships store. One I gave away, the other stayed with me until I left the service and lost it waterskiing! I then purchased a 7002A of which I have today with a Pepsi bezel, that is. Currently on it’s way to be serviced. I can’t wait to get it back!

Franky Wray
Franky Wray
3 years ago

I bought a Mickey Mouse Mumbai special , has the wrong back and there are two IDs inside , 6309A (faint) and what looks like S300A ..any thoughts ? ohhh and i’m lucky if the PR gives me 5 or 6 hours .

wouroud
wouroud
3 years ago

i have one

Rajesh Chaurashiya
Rajesh Chaurashiya
3 years ago

Kya price hh is modal kaa india mai

Agustin
Agustin
3 years ago

“Crown Location 4:00”

Well, that is not a movement feature, that depends on the case of the watch. There are 6309 watches with crown at 4:00 (like the 6309-7040) and also with the crown at 3:00 (like the 6309-8120)

Mohamed jaufer sadq
Mohamed jaufer sadq
2 years ago

I have used machine cooled 3609A Seiko 5 17 automatic woche I won’t sell srilanka wattala hunupiteya Wadikanda.

Miclos
Miclos
2 years ago

6309-7290 bought in 1986. Never cleaned. Works the same since it was new. Perfect.

Gene
Gene
2 years ago

I started my modding hobby with the 6309 diver then moved to the 7s26. Now, after more than 15 watches, I’ve learned to service the 6309s. Although the amplitude is usually on the low side, I am able to regulate them to less than 5 s/d with a beat error of 0.0. In a dial up position they are as accurate as my Omega! I am amazed at the timekeeping of these older Seiko watches.

Ian Watson
Ian Watson
2 years ago

I have acquired a very sexeh 6309 pepsi diver NOS set case, I do have a 6309 in a sideways oval case but I rather like the “eye” look of that and I want to put instead my modded 7019 movement and dial/hands as I don’t like the case on that as its a bit bland imho. According to the stats, there is a .3mm height difference between the 6309 and 7019 and wondering if this is going to be an issue or will I need to use a thicker caseback gasket to gain that extra room? I know this… Read more »

John Reyes
John Reyes
2 years ago

My mom gave me my dads 6309 in 1998, when he passed. I put it away and just pulled it out of storage. The crystal is broken, I found a plastic replacement but would like an original glass one, any suggestion on where I can get it replaced?

Adell
Adell
1 year ago

Cool

IMG_20220725_133017.jpg
Adell
Adell
1 year ago

Seiko 6309-6100. -1 sekond for day

IMG_20220715_183518.jpg
Bay
Bay
1 year ago
Reply to  Adell

I have a Seiko 6309-7040 turtle that I bought in 1979. I have used it continuously since then. Finally had it serviced for the first time on 8/10/2022. It is perfect. Can’t believe a watch I have dived, swam, snorkeled and exercised with still is running as if new. My watchmaker said I should use a cheap watch for exercise and take care of my 6309 because it is highly collectible and in such good shape.

Bay
Bay
1 year ago
Reply to  Bay

My 6309

AC3A8627-DB65-465E-B3A1-5CC0A8AA4C40.jpeg
Minotaur
Minotaur
1 year ago

SEIKO 5 6309-8800 A5 from October 1984 none service from that, still work . Amazing watch . My Favorite for all time .

Seth London
Seth London
1 year ago

Hi, I have a Seiko automatic with the 6309 movement. I’ve had it since new and it’s never been cleaned. It is still running great but losing a little time. I’ve removed the back and can see the adjustment. I can’t seem to find instruction on how to adjust plus or minus. Could you please show me where to find this adjustment in the instructions.

trackback
List of Seiko Watch Movements Watch Movement | Caliber Corner
1 year ago

[…] 6309 […]

PIK
PIK
1 year ago

Hi, can anyone tell me the internal diameter of the mainspring barrel for this movement, please?

Romangarcia33@outlook.es
Romangarcia33@outlook.es
1 year ago

La verdad que a la ora de buscar imformacion es de lo mejor que hay espero que agraden el listado siempre que necesito imformacion de un calibre esta página es de las primeras y mejores

Ken azano
Ken azano
1 year ago

Help!
Hi, I own a 6309 7320 model, the movement works perfectly but I would like to modernize the look, can anyone help me find out if I can fit this movement into a NH35 casing

john
john
1 year ago

can anyone tell me is this is the movement used in a Seiko 5 7019-8180 and if so what is a recommend replacement ?

Barbara
Barbara
7 months ago

I need a address 4 ship and repair

Mike
Mike
7 months ago

Just a nice watch. Mine looses 30 secs per day maybe needs servicing for better accuracy.

Agustin
Agustin
7 months ago

Hola adquiri un seiko 6309 8080 de 1978, necesito saber por favor caracteristicas, opiniones, su gama, y cuenta con dias bilingues pero no se que idioma son, uno es ingles y el otro no lo se, el dia domingo lo pone como DIM, gracias

DAMUS
DAMUS
6 months ago

“I have a 25 year old 6309 7290. It hasn’t been cleaned in at least 10 years. It advances 1 to 2 seconds in 12 days.” AAGAGAG- WAHTB A FUKIN LOOSER, WHO DOES HE THINK HES TRYING TO DECEIVE??.. AHH IDITO BEING.

Harvey
Harvey
6 months ago

I have a 6309 5020 seiko 5 i bought refurbed from India on ebay for 25 bucks delivered around 5 or 6 years ago, if I remember correctly , still works great

swe oo
swe oo
5 months ago

very good today

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