unfortunately not.............but if you try the search facility on the Board I seem to recall Ivo mentioning a Continental manufacturer some while back, I think, and you might pick up other ideas at the same time. Perhaps the Mods. can tweak the subject heading to attract the States collectors - always possibly they might have some suggestions.
If you look at the known Davidson pieces, you'll see the general idea of the sort of design/style that most of those follow. Quite simple and without any flowery surface decoration. Do you have any definite pieces of Davidson Jade?
However, you have a nice piece of (someone's) jade, and you always have something to do on a cold winter's evening i.e. searching for the maker

- what if any is the extent of wear on the underside of the foot?