This is a compensating Double Horn by Herbert Knopf. Compensating doubles are much lighter than a full double - yet they have all the range as their heavier counterparts. Tuning a compensating double is a little more involved - but once it's set they're great horns. Knopf compensating doubles are rare. This one is made of lacquered brass - the valve compression is about 68.00%. Conn FB plastic case included.
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