This is a 3+1 compensating euphonium with a medium shank. Condition looks good, and note that the seller says valve compression is outstanding. It appears to be silver plated. No hard case, but it has a nice Altieri gig bag. Bid starts at $900 and buy-it-now price is $1,300 (excellent price). The seller's description is below.
THIS IS A REALLY GOOD PRICE - DO NOT WAIT!
ITEM HAS SOLD FOR $1,300 - CONGRATULATIONS TO THE WINNER!
https://www.ebay.com/itm/Besson-New-Standard-Compensating-Euphonium-3-1-Valves-Medium-ShankMP-with-Gigbag/313386823161
Besson New Standard Compensating Euphonium 3+1 Valves Medium Shank with Gigbag. Condition is "Used".
Has a few dents here and there but valve compression is outstanding. Finish still looks good too.
Comes with Altieri Gigbag (Has backpack straps)
And a Brian Bowman BB1 Euro Shank Mouthpieces
Remember, this is a EUROPEAN SHANK horn (Medium Shank)