The same seller had the same locks with Colt, Winchester, Marlin, Sharp, etc markings on them and similar provenance claims. I'm sure they were all original, right? Years ago we used to say " It must be true, I read it in the newspapers" - now " It's I saw it on the internet !" Ed. ( PS: Receiver hitch lock is a good guess, as S&W sold receiver hitches and hitch plugs in the past. Ed )