I may have posted this before in the distant past. I can't remember. Anyway, if answers were forthcoming I don't know what they were! So does anyone know what this is or is a replica of? I'd always assumed it was just a novelty cap gun in the style of a 2turn off" percussion pocket pistol. It will be evident from the photographs that the flash from the cap would have to go through the small hole underneath the thread and than pass through the threads to set off the charge. Can't see that working somehow! However, I did once see a picture of an identical item described as a "Remington pocket pistol" in an auction catalogue at Scotarms. It was described as S58(2) indicating an original antique. Confused? I was.