Very difficult to say through all the patina. It's a close call, but I'd say elm. If you could have a look on the underside where it's not been polished you might get a better idea - Rob
Normally I wouldn't comment on such a thread, as I don't consider myself expert enough, but having compared some Oak and Elm just recently for a job, I would say it is almost certainly Elm.
Elm? Look at the figure if there is any, its kind of dappled on elm and called a partridge figure, or is it quail? Grouse?… well something you can shoot anyway. Also I don't think elm has very pronounced medullary rays like oak
Don't think it's elm. The differences in density between the growth rings is bigger than I'd expect, and it doesn't have that "partridge feather" fine patterning that elm usually shows. I'd go with ash.