I'll have to confirm 100%, but I think they are. I could be wrong, it happens... But, I do have a similar one that 100% has unplated brass keys, and another one where I think someone plated the keys and posts nickel later (worn off in areas-absolutely brass underneath), as the rings are unplated brass. These I believe are all from the ~1860-1884 era, pre serial number Buffet Crampon. The raw brass keywork I've observed more often on the boxwood (yes, they exist, I messed up bidding on one years ago otherwise I would have one!) models contemporary to these blackwood versions.
