I have been asked to look at a Breitling Crosswind Special Big Date chronograph watch that is fitted with dual date discs on an ETA 2892-2A movement. The movement has the Dubois Depraz module on it. The issue with the watch is that the date changes two days at a time ie goes from say the 2nd to the 4th when the date changes before midnight. It does the same thing when manually changing the date so making sure it is not altered between the hours of 8pm and 3am you can set the date to say the 2nd then manually wind the hands forward using the crown and just as the date is due to change it jumps forward two days.
I have not had chance to look at the watch yet or take it apart but has anyone else had a similar issue with this calibre as it is a workhorse in many brands? Any thoughts as to what may be the issue with it would be greatly appreciated.