MikeO,
Mine is the 500 2 5/8 or 12.7x65R as defined in the country where it was built. It is a Heinrich Scherping with damasscus bbl's made in Hanover Germany in the 1880s and can be seen in a thread here with some of my other Scherping back action guns. #Post106070 or just by searching Scherping, Nakihunter was nice enough to post some pic's. It is the one with the claw mounts on it.

m4220