15cm f4 Hugo Meyer Doppel Plasmat lens in 1-1/200 sec Dial-Set Compur Shutter. Nr. 281159 matching front and rear cells, circa 1929. Glass is clear and clean without any major flaws, shutter works and sounds pretty accurate (not tested for accuracy), diaphragm smooth and circular. Including mounting flange, threads measure 49.84mm. Sold as a collectible, no returns, buyer pays shipping.