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It wasn't only Bren butts but Mk5 Sten gun butts and pistol grips too that came over as cut-to-shape blocks. Made from an oily maple type wood that was impossible (?) well...., you could if you were...

The obvious point is that the C you mention aint either the Canadian arrow within a C OR Calgary Ord Depot. To be honest, I have never heard of a Calgary Ord Depot stamp and it certainly didn't...