Ok, so I know many responses before even writing this!
My 300 looses give or take 5 secs/week when I leave it on my wrist and sleep in it?
Take it of and leave it dial up, everything is fine.
Like I said, I know there will be responses of 'you know what to do, take it off at night then', but I thought this calibre wasn't meant to loose?
I love the watch and I think like many of us I am just being a little OCD?
Does anyone else have any similar experiences?
Thanks.

 

If it’s a METAS certified master chronometer and is running within spec, it should not be losing any time at all.

 

If my 3861 wasn't losing time I would need to hack every week instead of balancing gain/loss by positional variation at night so I'm OK with that.

 

5secs/week are 0,00083 % deviation a week...would say this is well within METAS-Specs..

 

I’m always interested to know how people measure such tiny losses or gains.
I used a watch tracker app for a while, but found that it was as much a test of my reaction time to press the button as it was a measure of watch accuracy.
Yes, maybe my watch had lost half a second in twenty four hours, but maybe I just hit the button a bit slower the second time...

 

METAS spec is 0 to +5 SPD. That being said, I agree that a loss of 5 seconds per week is extremely accurate and could probably be improved upon with positional variation when not worn.

 

Theoretically this is out of spec but for 0.7 seconds a day I wouldn't even bother taking a trip to the dealer. Let alone lose the watch for weeks to have it adjusted.

 

There is a great thread by @Archer that you should read

https://omegaforums.net/threads/timing-tolerances-a-guide-to-understand-how-they-work.87293/

 

Yeah, that really should be a sticky.

 

This is a common belief, but it is not true...

 

I stand corrected! Just based on my own experience with my Globemaster which is relentlessly +5 SPD no matter what position I leave it in.

 

My experience exactly. Also a test of my ability to pinpoint the position of a second hand of a watch I have trouble reading the date on.

I've found my METAS watches to be incredibly accurate and nearly immune to positional variance. If it's + or - a few seconds at the end of the week or the month I'm not bothered, and am likely to have to reset anyway because I generally have several in rotation.