Serial Number Signature Specifications Comments 25902 USA Line Grand Rapids Band Instrument Co. Acording to source, the instrument ws built between 1898 and 1926. Instrument corresponds to the York Model 51 Monster Bass in Eb from the Oliver Ditson guidebook fro the 1920s. Mich mellophone Has 1910 patent date and union label.
Instrument bears union label.
There are two tuning slides and one is approximately two inches longer than the other along the centerline. The left hand slide grip has two crossover tubes instead of one. Instrument has union label. Larson dated the instrument at 1900. Mouthpiece is marked York and Son.