Tuba - Sanders Imperial 4/4 BBb 4 Rotary Valve

Very good condition 4/4 BBb 4 rotary valve concert tuba. .750 Bore 16.5" Bell, 42" Long, Uniball linkage modified with heavier valve springs for faster valve action. Great intonation and response in all registers, provides a rich, full, resonating sound. Fits well with concert bands to brass quintets.
Finish has a few minor blemishes, at thumb-ring where hand rubs on bell (1.5" dia) and on 1st valve tuning slide. Small flat dent on lead-pipe near outter wrap, otherwise excellent.
Additional pics available.
Comes with wheeled case. Will consider reasonable offers.