Seiko caliber 6309

Seiko Caliber 6309

Seiko caliber 6309

BrandSeiko
Caliber Number6309, 6309A
Movement TypeAutomatic
Lignes
12”’
Diameter
27mm
Height
5.3mm thick
Jewels17
Vibrations Per Hour
21,600 bph
Power Reserve47 hours
Lift Angle
54.5 degrees (needs confirmed)
Shock SystemDiashock
RotorBall bearing
Mainspring401615
Balance Staff311601
Hands1.5mm x 0.90mm x 0.20mm
Hacking?No
Manual Winding?No
Crown Location4:00
FunctionsHours, minutes, central seconds, quickset bi-lingual day, quickset date
Country of ManufactureJapan
Known Models6309 (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.

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:

  • View more Seiko calibers here
  • Shop Seiko watches here
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carls
carls
3 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
2 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… Read more »

schilviu
schilviu
2 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
10 months 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
5 months ago
Reply to  Andrew Barwell

You are so correct!

Steven Turner
Steven Turner
3 months ago
Reply to  Andrew Barwell

indeed

Vlad
Vlad
2 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
2 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… Read more »

Andre
Andre
1 year 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… Read more »

Julian
Julian
5 months 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
2 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
1 year ago
Reply to  Emrah

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

Matthew
Matthew
2 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.

trackback
Seiko 6309-7290 Review - A Classic Diver From The 80s - iknowwatches.com
2 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
1 year 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
1 year ago

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

Jack
Jack
10 months ago
Reply to  Caliber Corner

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

Placide
Placide
1 year 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.
1 year ago
Reply to  Placide

What is wrong with it?

Auburn Senn
Auburn Senn
1 year 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
10 months ago
Reply to  Auburn Senn

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

rictors
rictors
7 months ago
Reply to  Andrew Barwell

that’s what i wanna know

julian
julian
5 months ago
Reply to  Auburn Senn

Over 50 pieces??? I´m so jelous!

Terrell
Terrell
1 year 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
9 months 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
1 hour 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.

Julian Rafalko
Julian Rafalko
7 months 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
7 months 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.
7 months 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 months 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 .

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