Deep Sea accuracy- wow!

[arobotathome]

I've had my new Deep Sea since last Friday.
I'd calibrated it to Time.gov Saturday morning.
It's now Tuesday morning.

In 3 days, it is still spot-on.

For comparison, my less than 1 year old Sea Dweller is about 3 seconds fast per day.

[seantk]

- My DSSD is accurate +/1 sec per day


Sean

[hflee55]

Mine is +/1 a day too. Looks like the DSSD is pretty accurate.

[padi56]

Originally Posted by arobotathome

I've had my new Deep Sea since last Friday.
I'd calibrated it to Time.gov Saturday morning.
It's now Tuesday morning.

In 3 days, it is still spot-on.

For comparison, my less than 1 year old Sea Dweller is about 3 seconds fast per day.

Its the same movement as in the SD Cal 3135 its swings and roundabouts. But as long as they run to or inside COSC thats all that matters whats in a few seconds either way.I have a 5513 that runs plus 1 second a day and a $60 dollar Alpha that after careful regulation has been running now for over 2 years well inside COSC spec.

[SeamasterGMT]

Mine is less than +0.5 secs per day.

My much loved Seamaster GMT is -15 secs per day but that is down to the swatch group's inability to regulate a watch.

[SDDS]

mine is the same too.. good to hear that...we r all then accurate...

[dardeca]

What is COSC standards? My SS Daytona is +1.5 seconds over a 32 hour period (I didn't have the watch with me to determine the 24 hour difference) when left lying face up on the dresser. I believe I read in a post somewhere that lying face up can add a second or 2 to the time...so mine could be spot on!!

[padi56]

Originally Posted by dardeca

What is COSC standards? My SS Daytona is +1.5 seconds over a 32 hour period (I didn't have the watch with me to determine the 24 hour difference) when left lying face up on the dresser. I believe I read in a post somewhere that lying face up can add a second or 2 to the time...so mine could be spot on!!

The Swiss COSC standard is -4 to +6 a day, the European Din standard and the Japanese equivalent for chronometer mechanical watches is -2 to +4 seconds a day

[Ken Cox]

I have a theory that the same movement will keep better time in a heavier case due to the increased inertia of the case.

A heavier watch experiences lower accelerations than does a lighter watch, and therefore lessened external interference with its internal works.

If my theory has any merit, then one could take the same 3135 movement and move it back and forth between a Sea Dweller and a Deep Sea and it should keep better time in the heavier Deep Sea case.

=====

My 1986 GMT Master II has had three services in 22 years, and it has kept different times, based on regulation, after each service.

It has, after one service, kept to +.3 seconds a day.

Presently, it gains exactly 4.8 seconds a day, day after day after day with absolutely no variation.

I think of the absence of variation as the true indication of accuracy, and so, by that measure, my watch keeps perfect time; just not in sync with the rest of the planet.

My grandfather's Hamilton 992B gains four seconds a day, and when I first observed that it upset me, as I expected better "accuracy" from it.

Now I see the consistency of the gain as the relevant measure.

[Lion]

Ken, I understand what you are saying but that is within the standard for COSC certification. Also as posted before it still has a high accuracy rate, somewhere above 99%!!!

[arobotathome]

I'm on the fourth day, and the watch has gained in the area of 0.25 to 0.5 seconds over this period.

That amounts to +.0625 to +.125 seconds per day!

[RJC]

Totally agree with everyone, mines the same - gains approx 2-3 seconds per week max!

Way, way better than my last SD