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Altho I don't own a co-axial (my Bond SeMPC is the 2531.80), when I've done time tracking on a variety of 1120 movements, an apparent "jump" of several seconds during the day is not uncommon. While I think the term "settling down period" is way mis-used, I will say that "random" precision accuracy checks can drive one crazy.
I always check against the US Naval Observatory Master (atomic) Clock. I own the Treo 650, and that's set automatically by satellite, and it can and will swing by up to 30 seconds at any given check. So that's not reliable at all.
The way I use my Treo to check time is to set the USNO Clock telephone number (202.762.1401) as a speed dial.
Additionally, I set up a matrix to check the watch I'm wearing during 1-hour windows in the morning, mid-afternoon, and late evening. You'd be surprised at the variability of just this range. Checks are then apples-to-apples, eg, gain/loss am today, versus am yesterday, et cetera.
We can talk more about this after the holidays if you'd like. I'm now way late to wrap up my Santa duties!
Merry Christmas!
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