Here's another 1941 Otto Sindel Police holster currently on ebay.
http://www.ebay.com/itm/1941-GERMAN-...YAAOSwV-RXEt7p
Over stamp on the manufacturer and date - I've not seen that before. Coming on the back of 2 same condition holsters available over the last year - Threads exposed again on a late holster - leaves me cold.