Technical description: Blackwood with silver plated german silver ferrules and keywork. Five pieces: mouthpiece, curved barrel, upper section, lower section, bell. Sharing one red mouthpiece with (5393). Full Oehler system with basset extension. Disconnectable C sharp mechanism. 21 keys, 5 rings, 1 plate, 4 black rollers. L0: T; speaker corresponding with first ring. L1: T + ring + vent; throat A?; throat A?. L2: T + ring + vent; alternative cross key for F4/C6. L3: T + ring; E?4/B?5. L4: C?4/G?5; E3/B?4; F?3/C?5; alternative lever for B?3/F5; alternative lever for G?3/E?5. R0: E?3; D3; C?3; C3. R1: T + ring + vent; side F4/C6; side E?4/B?5; side trill key for throat G-A or C6-D6; side trill for throat A-B? and B?-C; alternative touchpiece for C?4/G?5. R2: Plate. R3: T + ring (forked B?3/F?5); cross B?3/F?5. R4: G?3/E?5; F3/C5. Keymount type: screwed in pillars. Keyhead type: modern. Repair History: Vent hole in bell closed.