Following on from a recent thread decided to get mine out for a fondle.
The earlier Serial No's have barrels stamped with the Serial next to the keyway.
The later No's have barrels with Serial on the key steel and another three figure number next to keyway.
This three figure number is, certainly on one, stamped inside the trigger housing and the stock/trigger bracket.
Any ideas what that's all about ?
Photos tomorrow if any interest.