Edit...Darlinboy (our posts "crossed") as far as I understand, and without going into too much detail, those canvas straps Revo did replicas of were found on WWW watches (30T2 but not RAF) and on the later Omega 53 (cal. 283 movement).
However, if you're talking about the white faced, 1940s RAF watches (outfitted with 30T2SC) the most knowledgeable collectors will tell you the original straps were pigskin single pull throughs, now impossible to find.
Other options below, including a bespoke single pull through made of distressed calf leather.
It makes the watch look too big on a female wrist but I still like it a lot (and can provide contact for the craftsman).
Best regards,
S
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