Two days ago I received a Speedmaster Pro 3570.50 that I purchased from a reputable eBay dealer. I just had the bracelet resized today, so I've just begun wearing it and paying attention to its operation.
It appears that the hour hand of the chronograph is a little ahead of time (i.e., it is past the hour marker or the midway point between hour markers, when the chronograph minute hand is at 30).
I failed to note whether it is exactly aligned on 12 (i.e., "0" hours) when the chronograph is reset. I don't want to reset it right now because I'm watching to see if the overshoot grows with each passing hour on the chronograph; right now I've got pictures with the chrono at 1, 1.5, and 2 h elapsed time.
First, I'm asking for thoughts on the cause of and solution to this problem (or maybe this is within tolerance?).
Second, after 6 h of monitoring, the watch has picked up 8 s compared to my laptop clock (~32 s/d).
The case, bracelet, crystal, etc. are in near mint condition with nary a scratch. Thus, I'm a little surprised that it seems to have these mechanical issues.
One other bit of context: I have owned a Speedmaster Auto Reduced for several years and have had no such problems with that chronograph.