Originally Posted by
ccdjg
Hi Len. I think the intials almost certainly stand for Rheinhold Manteuffel & Co.,of Zella-Mehlis, who made Bugelspanners before and after the war, up until 1960 in fact
There is a discussion of the history of these (in German) in E.G.Dieter's book 'Air rifles and air pistols from Suhl and Zella-Mehlis after 1945'. If yours has the same intricate trigger guard as the one in the Myron Kasok collection, then it will be an early one, rather than post-war.
Cheers,
John