+/- 0 on Caliber 9906 while running chronograph continuously

Dan S

You know, there are actually watches specifically made to show time in two different time zones. Chronographs are for measuring elapsed time. 😀

Regardless of what a YouTube video claims, the idea that you should remember to start the chronograph running at midnight in a different time zone is absurd. 🤪

Jones in LA

Congratulations on your new Speedmaster!

Using your chronograph for a second time zone just makes your tool watch even toolier, which wouldn't be possible without the stacked hour and minute counters.

The Caliber 9300 is Chronometer certified, meaning the expected average timekeeping accuracy would be -4s/+6s per day. I am not aware of any timekeeping standard that is applied explicitly to the chronograph function on its own.

Edit:
Oops. I mis-read your post. Your watch actually has the 9906 manual wind movement, which is Metas certified. This means the expected average timekeeping accuracy would be -0s/+5s per day. Even if I had purchased this watch brand new from an Omega boutique or Authorized Dealer, I wouldn't worry a bit about a watch running one or two seconds slow per day. But that's just me. Others might want to have the watch regulated to achieve something in the 0/+5 range.

jasonvu27

I purchased my first speedy (2022 Speedy '57) about a week ago and it's been fantastic. Since I work with people with different timezone, having a 2nd time at a glance is important so I take the advantage of the minute/hour tracker of the subdial. Basically I started the chronograph at noon or midnight of the other timezone and let the chronograph runs continuously (Omega actually has an official video about this on their youtube channel on the caliber 9300 manual video).

One interesting thing I observed that the movement has been keeping absolutely perfect time at +/- 0s / day, basically no freaking error for the past 4 days that I've let the chronograph runs. I have not stopped the chrono yet, but prior to that I noticed that the watch runs about 1-2s slower after 2 days.

Anyone with technical knowledge can give some input on this?

Here is the video of mine:

YY77

I think it has more to do with how active you was before and after, also other positions the watch spent in those days which caused it being +/-0 compared to before.

This post also answers a watch' rate with or without the chrono running.

https://omegaforums.net/posts/1761916/

Archer · Apr 8, 2021

Yes

M marua_t

I've owned the spirate 9920 for about a year now. and did notice some differences compared to the twin barrel 8900 series and the 8800 single barrel series, Though an assumption. the twin barrel 9300 9900 series movements seem to have more torque. and seems to be more stable to friction flux caused by temperature, Another assumption was. with more torque. a slight beat error in the balance inertia bolts would cause more fluctuation of timing in each position,

From these prehistoric methods of observations. I feel the 9300 9900 movements are calibers that need more intense regulating. but when regulation is successful. they become more accurate and stable than the other metas movements,

With all that said. your specific movement may probably has a slight weight difference on a certain point on the balance wheel. and when torque to the balance differs. the slight off balance causes the balance to run slightly slower. causing the minus in your specic position,

There should be a position that runs fast too. so if you can find that position. rest the watch in that position to even out the minus.