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Help! SMP AC minute hand jumps when using chrono

My Seamaster Pro America's Cup Chronograph may have a problem: when I start the stopwatch the minute hand jumps forward (gains time) about one or two sub-second marks!

The jump is most noticeable when the stopwatch hand starts from the 12 o'clock position. If I start the stopwatch (getting a skip), stop it, and then restart it again without a reset, the minute hand does not skip ahead on the restart, or skips ahead very little.

The amount that the minute hand skips seems to be dependant on time of day, but I haven't discerned a pattern yet. I've seen skips of half a 1/5-second mark to two 1/5-second marks.

As I'm sure the participants in the forum understand, I take great care to keep the time on my SMP AC accurate. Two or three uses of the stopwatch and my watch gains several tens of seconds! Needless to say I'm a bit distressed. ;)

The watch is functioning nicely otherwise; I gain 1.5-2 seconds a day very consistently since I bought it about 4 months ago. I haven't dropped it or otherwise mistreated it.

Does my watch have a problem? Any suggestions on how to proceed? Other SMP AC owners have similar behavior? Any help is greatly appreciated

stuart

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