For fundraising purposes, I am listing this item for a limited time. * While I haven't set a specific sales period, I will remove the listing if I secure funding through other means or if I don't find a serious buyer. I apologize to those in remote islands (Hokkaido and Okinawa), but shipping will be at your expense. This is a Bach bass trombone from the American Bach company. I am only posting the photos I have on hand, and will add more later. The markings on both the slide and the bell read "50BL". I only vaguely remember the serial number being in the 15,000 range, so I will confirm it later with photos. * If the serial number is in the 15,000 range, it would have been manufactured around 1996. The known scratches and damage include lacquer stains around the bell rim (a common issue with Bach instruments, perhaps?) and some lacquer wear on areas that are touched by hand, as shown in the photos. (I will confirm later.) The valve cap (Hagmann valve) is engraved with the Hagmann logo. The construction is believed to be the same as the 50A3 GL below: https://www.nonaka.com/bach/instruments/trombone/bs_stradivarius.html#gsc.tab=0 It is stored in a bass trombone case designed for a Thayer valve (axial flow valve) type, but I had it checked at a musical instrument store in Nagoya when I had the Hagmann valve maintained in the past, and they said there were no particular problems. I was told that it plays well, but for peace of mind, I recommend having it professionally maintained before serious use. I can answer more detailed questions after I have confirmed the details later. I hope you will consider it.