The Log Cabin Shop has some Vincent rifles, but I'm not sure if that patchbox style is on any of their rifles, but I can check, as I plan on stopping over there on Saturday. Another source of information is found in volume 5 of the Association of Ohio Long Rifle Collectors, on page 105 there is a rifle with that style of patchbox and it is engraved, but the picture isn't all that great. A third source is to contact Campus Martius, in Marietta, Ohio. Bill Reynolds has a vast amount of knowledge and there is a healthy collection there, he may be able to guide you. You can visit the museum on the internet.