Boosey and Co., Compensating System, B flat euphonium, 4 piston, c.1917 | V & E Simonetti Historic Tuba Collection,Antique 1903 Boosey Class A Light Valve London Cornet Horn ~ Free Shipping | eBay,Boosey&CoテナーホーンClassA light valve - 管楽器・吹奏楽器,Antique 1903 Boosey Class A Light Valve London Cornet Horn ~ Free Shipping