Francis at Puretime told me they couldn't get the screws. I bought the watch from Angus 3 years ago and it was the Swiss 7753...
I'm going to order another watch - maybe they will 'find' the screws. Someone should have these - I've looked at Borel, Esslinger etc.
Technically - I think it's a pin - it measures approx 33mm (32.94mm)