Just seen a post on Instagram from CWC saying the have some RM MILITARY UTILITY WATCH STRAPs from 1982 for £9.99.
British military Marines issue date stamped '82. Falklands issue strap. 20mm will fit General Service and divers watches. Quick pull adjustment ensures exact fit and is easy to get on and off. Extra long 350mm length, which will fit over divers' dry suits or combat gear where the standard Nato strap is too short to do this.
The buckle stays threaded for ease of use, just slide it on & off.
Just pull giving resistance against the body to tighten.
Made in the UK when British kit was overconstructed.
In case you were interested.
PS I have nothing to do with CWC.