Also be certain the watch you are after had a service and ask proof of that. The chronograph wheel on the 6139 movements (both A and B), if is bad, it can't be fixed, and a new one, if you can find it, is 150-200€. So the service cost approaching the 400-450€ point if that is the case. You don't want to pay 800 and not be sure if it was serviced.
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