I have just bought a Boosey & Hawkes Emperor clarinet in a charity shop. I got it serviced in a shop near where I live. I recognised the wood as African Blackwood before I bought it (I used to be a flute maker) and the shop claimed that the clarinet is also at least 63 years old with sterling silver keys. What I can't figure out is that it has the measurements of a Bb clarinet but it is infact an A clarinet. I had a clarinet technician/teacher out to have a look and he said it is indeed an A but is the length of a Bb. Would anyone have heard of this before or know any info about it?