Also, I just managed to date it with the serial number on this page (http://www.horniman.ac.uk/media/_file/bandh_handlists_web.pdf) and it allegedly left the factory in either the end of 1955 or the start of 1956; if that helps.
Thanks Tony F. My Emperor measures 600mm with the original barrel (the wood and stamp are the same) but it is a semi tone down from Bb which would make me think it's possibly an A? Do you know why this could be and which clarinet it is that I own?
Also, if you have any sites with info on...
@Pete,
Thank you so much! You have made me realise that I was also measuring with the mouthpiece on, newbie mistake I'm guessing. I will have to buy a tuner and see if it is indeed in-tune to others.
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...