The horn looks to be in excellent condition, and I suppose is somewhat of a collector's item after Kanstul went under. It was made in California (being the only American-made compensating euphonium...ever, as far as I know). Response is typically very free and build quality is quite good. It comes in one of the best standard-equipment hard cases I've seen - very sturdy and fits the horn well, and I wouldn't be afraid to travel with it. Proceeds benefit animal rescue. Starting bid is $2,500 and the buy-it-now price is $4,999. Note that shipping is $142.41, so keep that in mind as part of the price when you bid.
SOLD FOR $2,500 - CONGRATULATIONS!
https://www.ebay.com/itm/254459545322?ViewItem=&item=254459545322