SH-21 Fine Regulation Possible in C60 Trident Pro Model?

Discuss Christopher Ward watches
Post Reply
Jasper5
Posts: 3
Joined: Thu Dec 30, 2021 10:41 pm

SH-21 Fine Regulation Possible in C60 Trident Pro Model?

Post by Jasper5 »

Hello Everyone, Happy (almost) New Year!

I am a spanking brand new member from the States and would like to contribute to this great forum. I currently have the C60 Trident Pro diver model, white dial, with the SH-21 movement, from the last batch produced (#246/300). My question to you is whilst the movement in my C60 keeps time within COSC limits, it does run a spark slow in most positions, typically 1-2 seconds slow per 24 hours. The movement has a fine regulator index and what appears to a cock screw, however, the "+" and "-" markings are absent by design. If I wanted to do a very careful fine timing regulation, which direction should I adjust the screw: CW or CCW looking head on down on the movement? I've regulated scores of ETA's, Miyota's, Seiko's and even a Soprod A10 in the past with great success, but I cannot determine the procedure for the SH-21. Any help you could provide would be immensely appreciated! Yes, I understand and embrace my anal retentive nature with timekeeping, but I'm playing the cards I've been dealt. :)

Best to All,

Frank
These users thanked the author Jasper5 for the post:
Laird
User avatar
Kip
The Administrator
The Administrator
Posts: 32729
Joined: Tue Mar 13, 2007 8:45 pm
CW-watches: 147
LE-one: yes
LE-two: yes
LE-three: yes
LE-foura: yes
LE-fourb: yes
LE-five: yes
LE-six: yes
LESeven: yes
Location: New Hampshire, USA

Re: SH-21 Fine Regulation Possible in C60 Trident Pro Model?

Post by Kip »

Having not worked on an SH21 movement I cannot offer any guidance here. I will say that anal retentive or not, Most would be absolutely delighted to have any watch this accurate and I suspect over time it will not vary much if worn. Personally, I would leave it alone.

How accurate are your other watches?

If-you-improve-or-tinker-with-something-long.jpg
Kip

"Asylum Administrator"


Visit the CWArchives for everything CW. Historical, specs, manuals and resale. It is all there.
Jasper5
Posts: 3
Joined: Thu Dec 30, 2021 10:41 pm

Re: SH-21 Fine Regulation Possible in C60 Trident Pro Model?

Post by Jasper5 »

Hello Kip and thanks for the reply Sir!

You are indeed giving me the best advice, e.g., "if it isn't broken, don't fix it." Thinking about it more last night, I most likely will leave it alone.
I have a several other watches in the fold, some I've regulated myself, some not.

Those not regulated / untouched by me:
- Rolex 16610, serviced 3 months ago, running at +3/day
- Omega 42mm diver (newest 310...reference), running at +1/day
- Breitling Chrono Avenger 43mm, running +4/day

Those adjusted by me:
- OWC 9411 Milsub, Soprod A10, ran -10s/day upon receipt. Adjusted, now running +2s/day consistently.
- Marc & Sons Pro Diver, Miyota 9015. Running +11/day received, Now running +3s/day after adjustment.

But just to satisfy my curiosity about the SH-21, if you look at the movement photo taken from a Worn&Wound review, one clearly sees the regulation index arm and screw. No engraved forward or retreat symbols on the bridge as in the ETA's and the like.
Image
I would still love to know how CW service would adjust this.
In any event, Happy New Year to All!

Cheers,
Frank
Jasper5
Posts: 3
Joined: Thu Dec 30, 2021 10:41 pm

Re: SH-21 Fine Regulation Possible in C60 Trident Pro Model?

Post by Jasper5 »

I believe I have my answer, and it was right here all the time, albeit from 2016!
general-discussion/difference-between-i ... 37267.html

Thanks Kip and Forum!

Frank
Post Reply