Running Slow

[mburl549]

Hi Guys,

What's an acceptable amount of seconds to lose on an automatic watch?

MB

[padi56]

Originally Posted by mburl549

Hi Guys,

What's an acceptable amount of seconds to lose on an automatic watch?

MB

The COSC spec is a Average of between -4 and +6 seconds over any 24 hour period. But thats with a fully manually wound watch to start with, try resting watch while off wrist flat dial up might gain a few seconds over night.

[mburl549]

Originally Posted by padi56

The COSC spec is a Average of between -4 and +6 seconds over any 24 hour period. But thats with a fully manually wound watch to start with, try resting watch while off wrist flat dial up might gain a few seconds over night.

Great thank you. what amount should be cause for concern?

[Puffy]

Rolex watches have a stricter standard of -1 to +5 seconds per day and hence the designation, "Superlative Chronometer Officially Certified" on the dial.

[mburl549]

thanks, this has been a great help.

[padi56]

Originally Posted by Puffy

Rolex watches have a stricter standard of -1 to +5 seconds per day and hence the designation, "Superlative Chronometer Officially Certified" on the dial.

Not 100% true movements of the Rolex size are all tested to the same Swiss COSC standard.The wording "Superlative" in front of the official designation of Chronometer, is today merely a Rolex marketing ploy to give it a more distinguished sound to the chronometer status of their products. Any words added before or after the official designation of Chronometer are merely purely marketing,likewise the wording Certified Chronometer,is a redundant phrase word, since getting the Chronometer status is the certification,but the certification is only at the time of testing the bare uncased movement at COSC,the added certified on the dial is just more marketing to make it sound better.But many of the Rolex watch servicers will try and better or at least equal the Swiss COSC spec standard.

[Megalobyte]

You'll get lots of opinions on what is acceptable accuracy. I'd suggest you sync to an atomic clock source, then check it in exactly 7 days. Then divide by 7. If you've lost 20 seconds or less most would say it's acceptable. Some would say even 28 seconds or less is good, ie the bottom end of the COSC. It's up to you, losing four a day average is ok, it's good enough, the question is, is a watch that is good enough, but not spectacular, good enough for you?

[khoi201188]

I adjust my sub 4 minutes faster
This way I will never be late, and I will never need to care about the variation of my sub , I cannot find any bad reason of adjust the watch faster