Wow, I learned something new today. I didn't know Germany (West Germany for that matter) was marking firearms like this carbine in the 1960s-70s. Was it a requirement before being sold onto the private market ?
Any firearm, which is imported (from most countries) to Germany has to be proofed (some exception apply, see the list).
http://www.google.ca/url?sa=t&source=web&cd=1&sqi=2&ved=0CCAQFjAA&url=http%3A%2F%2Fwww.beschussamt.de%2F&ei=7ICVTtiqNMm0sQLc4pHvAQ&usg=AFQjCNEuKQuswiWTsbW6xDo25xucuDMghA




















































