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unique collapsible Ernst Leitz GmbH Wetzlar prototype screw mount Summicron engraved 'F.M.157 Nr.0000024 on front ring, the lens is actually 9mm longer than a standard M39 Summicron, it comes with the same number of elements inside though the curvature of the elements is different (the front element, for example is much more flat), also the coating colour is different as well, provenance: ELCAN (Ernst Leitz Canada)