He looks to be wearing either a model '38 or '43 'crusher' field cap. Robin Lumsden cites many examples of SS personnel 'mixing' insignia on headgear due to wartime shortages at a local (field supply) level. The photo suggests he is sporting the old, Prussian style death's head instead of the issued 1934-pattern Totenkopf. Take a look at Lumsden's photobook "SS Regalia"pp88-89.