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https://forum.cartridgecollectors.org/t/canadian-7-92mm-and-9mm-hdstmps/6926

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I know the fellow who has the draw sets mounted on the boards.

Apparently the clandestine (false WW2 dated) 9mm was supplied to the US until approx. 1970 -

So who knows how long the 8mm was supplied...but I suspect into the early 1960s.