According to a reference book on Speedmasters my watch should have a 24-teeth 6,75mm crown. According to a site with Omega Spare parts it´s spare part no 43018 which is a 6,7 x 3,7 mm crown with
That reference ("A1 24-teeth...) is from the Speedmaster "Holy book" used by, amongst others, the auction house Bukowskis in Sweden. It's what their specialist on Omegas, and probably the "go-to" man in Sweden regarding vintage Omegas use to authenticate Speedmasters. I have a picture of that side of the book but can't post it due to copyright reasons. I could e-maile it though? Anyway that crown is almost impossible to find and most seam to use a similar but with modern logo and 32 teeth. However I DID find one today, NOS, so now it's of for service and change to its right crown! I'll get back with picture when it's serviced!
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