I decided I want to play a new instrument (sax will still me my main instrument), trumpet! I picked up a Boosey and Hawkes with case and mouthpiece fully functional for $55. The lady said it was 70 years old and that it was her grandfather's that traveled in the blues. it has a 7C mouth piece and its serial number is 307162, I have researched it but found nothing about this serial number. 1. How old is it? 2. What's its value? 3. Is it a good beginner trumpet?