I don't know the exact date of the Bourne auction. We're still looking for paperwork on the gun. Are there archives of the auctions? Apparently the Kynoch guns were sold over a period of time. One note was that most of the guns in the auction were extremely heavy barreled gun, probably used as test beds for testing ammunition. This gun isn't like that. My postal scale only goes to 10 pounds, but I'll bet that this gun is just under 10.5 pounds, as it feels lighter than my Rolling block BPCR, which is under the 12 pound limit for those guns.