I'm trying to decipher the inside of the holster flap (I don't see a Ku stamp), but I think I see:
"Ob. gefr" (which stands for "obergefreiter", I believe) and the date (in european format) as: 7-11-44 or November 7, 1944... I can't really make out the rest of the inscriptions, but iperhaps this was retrieved sometime after the initial Normandy invasion (given the date), and there are several records of the 12th SS who certainly did play a major role during the invasion. Here is one such link for you:
12th SS Document....