A" / trumpet and banner trademark incorporating "TRADE MARK" and "BOOSEY" / "COMPENSATING PISTONS / BOOSEY & CO.
Valve type: 3 Périnet type valves, bottom sprung alignment by key on pistons silver plated pistons. Ligature tuning slide at mouthpipe fitting for music card holder. Technical description: Brass 3 valve compensating system: 3rd valve brings loop into windway which passes through 1st and 2nd valves, these have short additional loops which are brought into the windway when used in combination with the third valve.
Bore: mouthpipe at c 70mm from mouthpiece receiver (minimum bore) 9.9 centre of valve cluster at c 231mm from mouthpiece receiver, v.t.s.
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