Based on the photos in the listing, I think the seller actually has the Adams marching baritone, not euphonium.
Photos of both for comparison (sourced from the Adams Marching Brass website)
Baritone:
Euph:
Regarding the euph, I do agree with you on how it played! I enjoyed briefly playtesting one a few years ago.
Last edited by Fujiifilm; 06-22-2021 at 12:56 PM.
Willson 2900 TA-1 Euphonium - Denis Wick 4AM
Yamaha YSL-643 Trombone - Bob Reeves BrassArk 5G "Gladstone"
Yamaha YSL-8440 Trombone - Denis Wick 5BS
VMI 3301S BBb Tuba - Schilke Helleberg
Past:
York Preference 3067 Euphonium - Denis Wick 4AL
Benge 165F Trombone - Benge Marcellus
Wessex BR140 Baritone - Denis Wick 6BS
F.E. Olds Special Trombone (ca. 1941)