Willie's BOND 007 mouthpiece for bass trombone. I believe this is an early model, before they started offering different sizes. It's gold-plated, but I've forgotten the size. Addendum: The rim appears to be 28.1mm. While there is some wear on the shank and rim, there are no noticeable scratches or dents, and it's in good condition. The plating is also well-preserved. If you're looking for an early model, please consider this one.