This is the JK (Josef Klier) Will Sanders model. I purchased it new from Nero Instruments about a year ago and have used it a few times since. It's in very clean condition, with the exception of some marks from the shank insertion. Here's the model information: Cup Inner Diameter: 17.75 Throat Diameter: 4.3mm Cup: U-cup Retail Price: ¥16,500 (tax included) Please understand that this is a used item and has been inspected by an amateur. Returns are not accepted. Thank you. Horn French Horn Mouthpiece Josef Klier Will Sanders