This is the J. Michael TR-500S. It's a top-of-the-line model from back in the day, and you don't see it very often on flea market sites or auctions. Here are the specifications I found online: * Key: B♭ (Bb) * Bell material, Mouthpipe: Red brass * Triggers: Equipped with triggers on the 1st and 3rd valves I think it's a rare model because current J. Michael trumpets don't have a double brace. I've played other J. Michael trumpets, but the TR-500S felt exceptional. The intonation was relatively stable, and I liked the moderate resistance. This is a used item, and the above information is based on my subjective opinion, so there may be oversights. Please understand this and consider it with no claims and no returns.