These sloping valve buttons and valve caps were characteristic for the Besson New Standard line, which along with the B+H Imperial line were the parallel top lines of the Boosey and Hawkes factory until around 1970, where the Sovereign line took over
7. Compensating loops
8. These sloping valve buttons and valve caps were characteristic for the Besson New Standard line, which along with the B+H Imperial line were the parallel top lines of the Boosey and Hawkes factory until around 1970, where the Sovereign line took over