FloridaMike, thanks for your input. After reading your reply I removed the watch from the safe, gave it 40 winds (CW only), and put it on the Timegrapher. I then wore it for an hour in the same environment to warm it up and did another set of readings. The ambient temperature is 78° at this time.
When the watch was serviced last year the watchmaker replaced the mainspring and barrel. The original barrel had a flaw that kept the mainspring from winding fully.
(Position - Variance - Amplitude)
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