Technical description: Blackwood with ivory ferrules and silver keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Speaker key at the front of the instrument operated by an ingenious ring mechanism. Shaped L4 levers, R4 tone-hole and key mounted in a fusiform swelling. Integral wooden thumb rest. 13 keys. L0: T; speaker. L1: T; throat A?; throat A?. L2: T. L3: T; E?4/B?5. L4: C?4/G?5; E3/B?4; F?3/C?5. R1: T; side F4/C6; side E?4/B?5; side trill key for throat A-B? and B?-C. R2: T. R3: T; B?3/F?5; side B?3/F?5. R4: T; G?3/E?5. Keymount type: blocks, swelling. Keyhead type: flat round.