As the title suggests, I have recently been handed a trumpet with only two valves, one of which requires a spring. Made by DEG with the Dynasty name. It has two water keys which require new cork seals and quite a length of tube. With some pressure on the keys to minimise the air loss, the lowest open note appears to be a "G". Any one have any information as to its uses and also range, in fact any and all information will be appreciated.