Seiko Caliber 7s36

Seiko Caliber 7S36

Seiko Caliber 7s36

Manufacturer Seiko
Caliber Number 7S36, 7S36C
Movement Type Automatic
Jewels 23
Vibrations Per Hour
21,600 bph
Shock System Seiko Diashock
Power Reserve
41+ hours
Magnetic Resistance 4,800 A/m (60 gauss)
Winding Direction
Not hand-windable
Hacking? No
Diameter 12”’ / 27mm
Height 4.8mm
Functions Hours, minutes, central seconds, day/date calendar
Country of Manufacture Japan/Malaysia
Known Brands
Seiko 5 Sport SNZG15J1 (add more in the comments below)

The Seiko caliber 7S36 is an automatic movement used in many popular Seiko divers and the entry level Seiko 5 watches. This movement was first released to the market in 1996. Seiko dive watches, such as the Orange Monster, have since been upgraded to the caliber NH36 (aka 4R36), making Seiko collectors happy because the 7S36 seen here does not hack and is not hand-windable – two functions that have become more and more popular. The caliber 7S36 is the last in the series.

Operational temperature range: Between -10 ºC and 60 ºC (Between 14 ºF and 140 ºF)

Other movements in this series:

Submitted by Daniel who says:
Been a solid runner, it gains about 30 sec or so a day.
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Seiko Caliber 7S26 Watch Movement | CaliberCorner.com
6 years ago

[…] 7S36 […]

Neteacher
Neteacher
5 years ago

My watch is very irregular, gains between 80-125 seconds /day.
First two weeks was -5sec/day, then +15sec/day. After two months was about +60 sec/day and now +80 to+125 sec/day.
Moreover SEIKO’s official service is opened only few hours during the week so it extremally difficult to repair it.

Todd Caldwell
Todd Caldwell
5 years ago
Reply to  Neteacher

Sounds like it could be lightly magnetised. If you have a friendly local watchmaker, he can run it over the demagnetiser for you, which takes 15 secs . And as I said, if he is friendly, it would be at no cost. It is the first step in diagnosing that issue.

Howard
Howard
4 years ago

I have the C varient and it will loose maybe 20s a day for two days when you start wearing, then by day 3 it will start gaining 10s or so a day. If your relatively sedetary 1-2 days it will start loosing time. Also I don’t experience a 40hr reserve more like 30hrs then it stops or runs irregular. In mixed 7 day use (from initial start up) Ive seen it gain a total of 20s over 7 days. With continuous use I expect a 1-2 min gain per week which is acceptable.

Camilo
Camilo
3 years ago
Reply to  calibercorner

Since this is an automatic movement with a day-date complication Just like those old and famous 6119 I wonder whats the diference betwen them and if are they better or worse then those from the 70’s ?

Gary
Gary
6 years ago

My son and I both have a Seiko SNZG15J1 with this movement. His gains 27 s/day, about what you would expect. Mine is unusual… it only gains 1.7 s/day, which I have carefully verified over a 2 week test period. Just good luck, I guess, but amazing performance for the price.

Zul
Zul
6 years ago
Reply to  Gary

I just bought last week, and my problem with this 7s36c sometime even i use the nedlle got stop

Fred VonFirstenberg
Fred VonFirstenberg
6 years ago
Reply to  Zul

“sometime even i use the nedlle got stop”

What does this mean?

marc luscher
marc luscher
5 years ago

ESL translation problem. the user has had the second hand stop while wearing the watch

Eamonn
Eamonn
6 years ago
Reply to  Gary

27s/d is quite a lot should say. Even if it’s a 7S one it can operate between COSC parameters, all my 7S are regulated and operate at less -/+ 5 s/d.

Powell
Powell
3 years ago
Reply to  Gary

2 years later, how are your watches running? Did you try to demagnetize the watch with the fast running movement? Is yours still running around a couple fast seconds per day? Really interested in an update 🙂

Oilseed
Oilseed
6 years ago

what’s the difference between the original 7S36, the 7S36B and the 7S36C??

Eamonn
Eamonn
6 years ago
Reply to  Oilseed

Main differences between those are improvements done on the materials used but mainly the movement is the same, I mean same configuration same fonctions. Is like reviewed and improved version nothing else.

John van Abkoude
John van Abkoude
5 years ago

I own a Seiko SNZF17K1 with this caliber. Can I somehow upgrade it to a caliber that has second hacking and hand winding?

Joe Wiseman
Joe Wiseman
2 years ago

Sure you CAN. if you’re confident or not afraid to ruin anything, you can replace it with an NH36/4R36. Virtually identical size, hacking and hand wind capable. Just make sure you get the proper crown placement

Elijah
Elijah
5 years ago

I ve a seiko snzb24j1 it works amazing I would wish my best friends go for it. It doesn’t gain or loss anything. I don’t regret at all.

trackback
Seiko Flightmaster SNA413 Review - The Best Seiko Aviator? - iknowwatches.com
5 years ago

[…] Seiko Caliber 7S36, 23-jewel automatic (self-winding) movement […]

Kit
Kit
5 years ago

Had this for 2 yrs – its now gaining 10 minutes a day and bracelet is scratching easy on strap.

joe
joe
5 years ago
Reply to  Kit

stop buying a bootleg watch

Andrew
Andrew
4 years ago
Reply to  Kit

You’re watch is almost certainly magnetized. RUn it over a demagnetizer and you should be good to go 🙂

RAF Onyx
RAF Onyx
3 years ago
Reply to  Kit

I agree with Andrew. Hairspring has become magnetized. Easy solution, as Andrew explains.

Jeevan
Jeevan
5 years ago

I recently bought a Seiko 5 Sea Urchin SNZF17 (7s36 movement) and while setting the time, day and date; I accidentally turned the crown in a counter clockwise direction. Would that be a problem for the watch?

Justin Hogge
Justin Hogge
5 years ago
Reply to  Jeevan

I hope someone else comments on this too, but from the little bit I know, that’s no problem to turn the crown counterclockwise. You can set the time clockwise or counterclockwise. If you go the wrong way when setting the date, it will click… you probably shouldn’t do this a lot. One thing you don’t want to do is set the date while the time is between 8:00 PM and 4:00 AM.

Jeevan
Jeevan
5 years ago
Reply to  Justin Hogge

Thanks Justin for the reply!

Tran
Tran
5 years ago

I bought a 7S36C. I’m wonderig about it a fake one. Please help me to verify it. Serial No. on case is 832160

Steve
Steve
5 years ago

My Seiko 5 sports has the 7S36 movement, has been a solid runner since 2009, with one service because I dropped it and the watch started over speeding ( a spring got caught up) anyway it’s still good and keeps time to around +5seconds a day. Good automatic watch.

Gamphy
Gamphy
4 years ago
Reply to  Steve

Exactly the same as mine, dropped and a spring got hooked up, fixed and been running good as gold since 2009

trackback
Seiko Caliber 4R36 Watch Movement | CaliberCorner.com
4 years ago

[…] movement was released circa 2011. This caliber was considered to be an upgrade from the popular 7S36 movement as it offers the user the desirable hacking and hand-winding […]

David M
David M
4 years ago

7s36 is also in SNZF15j2

Bill McMahon
Bill McMahon
4 years ago

Where can I find a replacement Bezel? Looked all over and cannot find one. Mine is a 7S36-03MO. I need a sliver bezel

Vlad
Vlad
4 years ago

My 7s36 (snzf15k1) works just fine. +1,9 / -0,9 That is even better than some 8k Swiss brands.

CB
CB
4 years ago

Hello all. My 7s36c Stops and starts. It now has a rattle when I move my wrist fast. I’m sure I dropped it one too many times. When I look at the back everything is stopped then I rotate the movement and it will kick start but not for long. Always end up stopping again. Is it doomed or can it be saved? Thanks. CB

Scott
Scott
3 years ago
Reply to  CB

Your rotor screw is likely loose. If you look at the caseback, it’s the screw dead in the center. Tighten it and you’ll be good.

José Maria Aguasca Ribot
José Maria Aguasca Ribot
4 years ago

Uso éste calibre correspondiente a un SNZG-13J1 fabricado en Japón, desde hace un año y es el mejor automático que he usado, con independencia de su precio.
Sin afinar, su precisión se mantiene en – 3 / – 4 segundos 24h.

Democrito G. Plaza
Democrito G. Plaza
4 years ago

I bought a Few days ago a Brand New Seiko w/ 7S36 mechanical Watch. I Got it frm TimeStudio In Cash & Carry. My Problem is after i wore it, in 2-3 hrs it would stop. Whats the Problem?

Louis B
Louis B
4 years ago

This happened to me as well – it seems the automatic winding does not work as well as a mechanical one. I opened the watch and wound it with a small tool, it works fine (about 36hours) but I think there may be a problem with the small part that pushes the winding mechanism… if anyone has had similar issues i’d be keen to understand how to fix it durably (that is, without having to open the watch and winding it manually).

Boyet Plaza
Boyet Plaza
4 years ago
Reply to  Louis B

How do i fix it

Boyet Plaza
Boyet Plaza
4 years ago
Reply to  Boyet Plaza

Thank you Louie B.

Julian
Julian
3 years ago

In my experience, it is “atrophy”. When watches have not been running for a long time, the coil in the main barrel is harder to wind.
I you don´t want to service it, just shake it for quite a while befor you wear it. After a few days, it usually winds up for many hours.

Felix de Vega
Felix de Vega
3 years ago

Got my seiko SNZG15K1 with the 7S36C movement two years ago. So far it works perfect, gains only around 2 or 3 minutes per month, so I am very happy with it, I can highly recommend it. However I’ve heard sometimes they are not that precise, maybe is a matter of finding a good working one.

daniel vielma
daniel vielma
3 years ago

hi i have a seiko 5 with the 7s36c movement that is not repairable. is there another movement that i can upgrade with? that is the same size as the 7s36.

thanks i,m new to the watch community
best regards Daniel

Powell
Powell
3 years ago
Reply to  daniel vielma

Maybe you can look into a DIY swap of the 7s36 with the nh36?

Daniel Vielma
Daniel Vielma
3 years ago
Reply to  Powell

Yes thank you that’s exactly what I did worked out awesome thanks again

trackback
Seiko 5 SNZH57 Review & Fifty Five Fathoms - iknowwatches.com
3 years ago

[…] have used their workhorse automatic 7S36 in this watch, which although not remarkable, is super reliable and a great buy at such a […]

John
John
3 years ago

I received a Seiko Sea Urchin on 3 July for my birthday. So far, it remains accurate to the second.

Love Denke Göransson
Love Denke Göransson
3 years ago

this movement is noticeably one of seikos cheapest as the seconds hand does not stop when you draw the crown out and this movement is also quite loud like you can hear it if there is no other noice even if you arent holding it close to you

Rhea Gallego
Rhea Gallego
3 years ago

Do you have a 7S36-03MO glass for replacement

trackback
Bulova vs Seiko: Which Is The Best For You? | Watch Researcher
3 years ago

[…] watch is powered by a highly appreciated 7S36 automatic caliber and goes with the majority of wrist sizes and shapes. A coin-edged bezel is both practical and […]

Ravindran Singaravelu
Ravindran Singaravelu
3 years ago

Do you have watch glass for replacement. Mine cracked. Model 7s36

Bryan Baxter
Bryan Baxter
2 years ago

Are the 7s36 and the nh36 interchangeable?

Gary
Gary
2 years ago
Reply to  Bryan Baxter

Yes, basically it’s the same.Are you going from 7s26 to nh36 or the other way? Assuming you’re upgrading for hacking. You will need a new crown either way.

Bryan
Bryan
2 years ago
Reply to  Gary

Yes upgrading. Thanks for the reply. That saved me a lot of comparison research.

Daniel
Daniel
1 year ago
Reply to  Bryan Baxter

Best if you can find 4r36, same stuff but with seiko’s mark instead of epson

Josep Maria Aguasca Ribot
Josep Maria Aguasca Ribot
2 years ago

Uso desde hace cuatro años un ‘field watch’ con calibre 7s36, fabricado en Japón y tengo para mí, que a pesar de que digan que los controles de calidad en Malasia son los mismos, las unidades japonesas tienen mejor isocronismo y precisión.
La regularidad de este ‘field watch’ es asombrosa y su precisión (-2 segundos – 24h.), digna de encomio.

BillyC
BillyC
2 years ago

Had one for two years in a Seiko 5 Sports and it started gaining a few minutes per day. Seiko Service quotation is only a few pounds cheaper that buying a new watch 🙁

Jeff
Jeff
2 years ago
Reply to  BillyC

Probably magnetized. You cam buy a demagnitizer for less than $20

John perrotta
John perrotta
1 year ago

What capacitor battery does this watch use?
Seiko 5 Sports 7S36-04E4-R-2
7S36-03C0 AO KY950307
23 Jewels Stainless Steel
SEIKO Time corp.

Daniel
Daniel
1 year ago
Reply to  John perrotta

It’s auto, doesn’t require battery. You sure you know your stuff?

John P
John P
1 year ago
Reply to  Daniel

I’m a novice! Was told I need to replace the capacitor. It does have a capacitor, right?

Matt Walters
Matt Walters
1 year ago
Reply to  John P

No, the 7S36 has no capacitor. Unlike a 5M36 Kinetic.

John P.
John P.
1 year ago
Reply to  Matt Walters

then is there an internal fix for a watch that does not stay running after a very short time of non use?

Matt Walters
Matt Walters
1 year ago
Reply to  John P.

The best fix for your problem, is to wear the watch. It being an automatic, it will run out of power, if it does not get wound. Your movement will reach 100% power after approx. 8 hours of movement. Power reserve is then approx. 41+ hours. You cannot hand wind the watch! Do the “Seiko shuffle” for a few minutes to get the watch running. Then wear it. It will not over wind.

John P
John P
1 year ago
Reply to  Matt Walters

Thank you very much Matt. That was very helpful.

Ted
Ted
1 year ago

Seiko 5 Compass model SKZ211J1 same engine

Joseph Muteti
Joseph Muteti
1 year ago

My seiko 5 sports watch gains about 30seconds in a day, is it normal really?

Robert DeLuca
Robert DeLuca
1 year ago

I have a Seiko dive watch. It has 23 jewels and is a date complication only. I need to order a mainspring and am having a hard time. It is a 7s36B movement. Can anyone help Thank you.

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

[…] 7S36 […]

C2r2
C2r2
1 year ago

My Seiko SNZF27 7S36 dies if I don’t wear it everyday. Doesn’t matter if I wear it everyday, within 24 hours of sitting it stops. I love the watch but it can be a pain to reset time, day and date. I need some advice.

Rajendra
Rajendra
1 year ago

Price please

Peter Tham
Peter Tham
11 months ago

My seiko are not very accurate, they go forward +20 to +40 seconds a day, they are about 6 years old, I started wearing them daily only a year ago

James Collett
James Collett
11 months ago

I have a Seiko 5 which was modded for me by a friend: I managed to break the movement, and he kindly replaced it. The flywheel has “7S36C” imprinted on it. My watch hacks and hand winds, which is not meant to happen for this movement, according to the spec list above.

Perhaps he re-used the old flywheel?

George Florendo
George Florendo
9 months ago

Bought mine last Oct. 2007, seiko 5 sports with 23 jewels, 7S36A, never been serviced and still working fine and accurate. salute to Seiko..

Bob
Bob
5 months ago

I bought a Seiko 5 Sports with this movement in it, late 2021. I gather this model has now been replaced by a plainer looking version, so maybe mine (which was new) was old stock. Initially I was super-happy with the watch as it kept amazing time for such a cheap watch. Then eventually I noticed it was losing a fair bit of time each day, then on one occasion a few months ago it stopped in the middle of the night, despite me having worn it during the day. So I had it serviced two months ago (at a… Read more »

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