Eterna-Matic Chronometer

[watchman11121]

I recently had an Eterna-Matic Chronometer from the 1950's overhauled and timed and the watch is accurate to 18 seconds slow in 24 hours. Is that an acceptable loss of time for a newly overhauled chronometer?

[aerome]

Jun 15, 2008 0:45:30 GMT -6 watchman11121 said:

I recently had an Eterna-Matic Chronometer from the 1950's overhauled and timed and the watch is accurate to 18 seconds slow in 24 hours. Is that an acceptable loss of time for a newly overhauled chronometer?

Have it retimed just for the heck of it. A good movement should be a bit tighter than that.

[Archer]

Jun 15, 2008 0:45:30 GMT -6 watchman11121 said:

I recently had an Eterna-Matic Chronometer from the 1950's overhauled and timed and the watch is accurate to 18 seconds slow in 24 hours. Is that an acceptable loss of time for a newly overhauled chronometer?

Welcome to WWF!

To answer your question, I would say "it depends."

Keep in mind that a chronometer movement is only as good as it's last service. Although many movements are capable of chronometer status/performance, it doesn't mean the result of a service will always meet that standard.

By the way, you haven't really given enough information to judge the movement's performance. If it is -18 seconds in one position each and every day, then it is a simple matter of regulation for that one position. If it varies over several positions or within one position, then it may need adjustment in addition to regulation (those are two very different things).

Without knowing if the timing you have done is in one position, and is the same each day, I can't really say much more. If you can time it for several days in 3 positions and report back then this might help. For instance, 3 days dial up, then 3 days crown down, and 3 days crown right. Record the amount the watch gains/loses in each position over each 24 hour period as compared to a known standard like time.gov. This way we can see if the rate is stable or if there are other problems.

Hope this helps.

Cheers, Al

[watchman11121]

Thank you Al! I appreciate the welcome and I will time the watch in various positions and see what kind of variations develop and place the information on the board. Regards Tim