This is a Denis Wick 6BL gold-plated trombone/euphonium mouthpiece. It is a large shank. The list price is around 39,000 yen. The gold plating is wearing off overall. I purchased it used, so I don't know the history, but there is a dent on the rim. I've included it in photo 6. In my subjective opinion, there was no discomfort in the feel or the way it felt in my mouth when playing. The original box is not included, so I will wrap it in bubble wrap and ship it in a box of a suitable size.