Thanks for the post and pictures. Original Trommel (drum) magazine covers are extremely rare. In fact, there are serious collectors who doubt the existance of real ones from the period. People have been turning out fakes of these for over fifty years now. However, there are convincing pictures of some originals, but even the pictures are very rare. Do you have the loader too? The loaders are also rather scarce and have sold in the $900 - $1800 range, depending on condition, etc. Now you mention an "adaptor". Do you mean the cover that slips over the top of the magazine or the metal device that would allow you to use it with a MP18? The cover has sold for anywhere between $200 and $600 but the adaptor is generally about twice that, but you have to find somebody with an MP18 or a real serious collector that needs one, which is a rather limited market. Best of luck and thanks again.