I had to have this gorgeous strap with an unusual blue shade made by Giuliano and finally found a watch for it:
The strap nicely corresponds to the bezel of my mystery Heuer Skipper, a ref. 1564 cased in a ref. 15640 case marked "1564". The movement is based on a Heuer cal. 15 with a minute counter rotating twice as fast as usual.
Still with the striking 10th, the tri-Color is very nice. On the way from Tokyo to Singapore, I will be returning the tri-Colour to my dad in BKK over the weekend...