Howdy
Funny you should ask. I was at an auction a few weeks ago at the Amoskeag Auction house in Manchester New Hampshire. There were two revolvers up for auction that had been used in the movies, both from Stembridge.
The first one was a Colt 1860 Richards-Mason Conversion that Clint Eastwood used in The Outlaw Josey Wales. It was converted to shoot 38 caliber blanks. I picked it up and examined it at the pre-auction viewing. Everything worked, the action worked fine, but the cylinder was extremely loose. Too loose for live ammo, but it did not matter for blanks. It was also interesting the way 38 caliber sleeves had been welded into the chambers. The barrel was not modified, so the original 44 hole showed at the muzzle. In the movie the gun had been pulled out of the remains of a burned down house, so the grips were partially burned. I doubt if they were the original grips, probably just something Stembridge made up for the movie.
Here is a link to the auction item, hold onto your hats when you see what it sold for. The auction estimate was $5000 - $7000. There was one guy in the room who really wanted it, but he was bidding against guys with incredibly deep pockets on the phones. Eventually he dropped out, I think he went up over $10,000. One of the phone bidders won it. You can click on the photos to get a better view.
http://www.amoskeagauction.com/98/199.html
Here is the other gun, an old SAA used by Gene Autry in his traveling cowboy show. The auction item says it was originally 44 caliber, sorry I don't remember exactly which 44 caliber. Don't remember if it said Frontier Six Shooter on the barrel or not. The cylinder on this one was sleeved down for 22 rimfire blanks, which made the front of the cylinder look really weird. And heavy too. The firing pin had been altered for the rimfire cartridges by some simple grinding. Not real pretty but it did the job. The auction house estimated this one would go for $5000 - $8000. This one went to somebody on the phone too.
http://www.amoskeagauction.com/98/200.html
Incidentally, I hate these deep pocket guys who phone in to an auction without bothering to show up. I lost out on a beautiful Triple Lock that I had my heart set on that day. The opening bid was more than the auction house estimated for the high price. I was so flabbergasted it shot way up over what I could afford to pay. I never even got a bid in. Went to somebody on the phone.