I’ve had a request from a fellow enthusiast into the existence of overprint varieties on the Bechuanaland 1/2d vermilion used on cover. Specifically inverted or double overprints on SG numbers 53, 54, and 55.
I have not seen any before, but I have heard that in his long search the enthusiast has managed to find a 1913 Tamsen cover with a SG54a block of four. Presumably other philatelic covers from Tamsen must exist?
Any information would be greatly appreciated.