This traditional American euphonium was made in 1950 and is silver with gold wash inside the bell (based on photo). Buescher is not as well-known as Conn/King/Holton but they were in the same class and had a long production life (from 1894 to 1963). Condition looks quite good for the buy-it-now price of $399. There is a make-offer button as well if you feel lucky!
SOLD FOR $329!
https://www.ebay.com/itm/Buescher-Baritone-euphonium-Detachable-bell/274203786296