Model 1917 Bayern (Bavarian) Mannschaften (Other Ranks) Einheits (universal) Schirmmütze. The Einheits - Mütze was introduced in 1917 to replace all the various colored caps in use prior to that time. The cap is made from a rough Feldgrau wool, with black piping. By regulation the Bayern (Bavarian) 1917 an Einheits Schirmmütze should be made completely out of Feldgrau material, without a dark green band and piping like the other contingents,