I don't think you'll ever get a straight answer on that question OWD. Nobody knows what was brought in, how many or where they were being brought in from. Smallbore states in his books that he believes Osborne made the Lancaster body action guns (serial number with the 0 prefix). I'd like to know where he got that information too! Others speculate that Beesely made the guns. One thing is for certain..Thorne did have a factory, and did make guns. I believe all of the sidelock model A's were made there.