I believe that it does have the Breitling 23 movement. It is a SuperOcean Heritage 44 Caribbean Limited Edition. I was able to learn yesterday that the method for advancing the date is different for this movement.
For a Superocean Heritage Chronographe 44 there are 2 positions for the crown. When you unwind the crown, it is in position 1. In this position you can manually wind the watch – around 40 turns will fully wind this watch. The crown can then be pulled, just once, into position 2. In this position you can wind the time forward to midnight when the date changes, then wind the watch backwards to 8pm, and then forwards again to midnight. You repeat this backwards and forward winding until the correct date is set.
PLEASE NOTE: this is the specific instructions for the calibre Breitling 23 movement used in the black and green Superocean Heritage Chronographe 44 – ref: Winding other watches backwards at midnight could damage the movement severely.
The good news is there was nothing wrong with my watch. Sorry for the pointless question!
David
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