Does it reset to "zero" spot on when you stop and reset the hands, or is it a little off to the right? Also, when you start the chronograph, does the hour recorder move off it's mark slightly right as you start it?
The hour recorder is not driven by the same set of gears as the seconds and minute recorders are. Those 2 are driven by a wheel that is pressed onto the 4th wheel of the movement, where the hour recorder is driven directly off the mainspring barrel on the dial side of the watch. It's not completely uncommon for it to be a little disjointed from the others, but 15 minutes out is a bit much...
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