I can't add a tremendous amount here, but an old issue of the magazine "Wild und Hund" had a list of Ferlach gunmakers after 1945, including the makers' registration numbers. Josef Orasche is listed as maker number 30 which is somewhat intriguing as both of the Orasche serial numbers mentioned above start with 30. If the serial numbers are in the form of 30.xxx or 30,xxx rather than 30xxx that would make sense. Also the numeric string 2945.55 probably indicates that this was the 2945th proof house log book entry for the year 1955.