Edzackery, between 36-40, BUT........... why do almost all Deumer B-replacemnet badges have no number? are these all made after 1940 LOL. There are also B-versions known with numbers from M1/52, M1/78 and M1/49 - and if you want to include the RZM 15 from yesterday as well, then all makers (Except M1/70 which are controversial with collectors anyway) - But not many of them. As far as this numbered Deumer B-stück goes, i have asked a few collectors and nobody has seen one before, all they know are the unnnumbered B-stücke from Deumer.It has the safety catch plus the B plus the serial number so theoretically a badge that was ordered in 1939. However, it could be earlier if this was the same type of catch mentioned in the 1936 RZM instructions (discussed here)
....Still loads to clear up here