Manufactured in 1978 - Rare - Key of A - Full Boehm System which has a range to low Eb. Includes an articulated C#/G#, An extra ring for the left hand's third finger, providing access to a forked-fingered chalumeau E-flat/clarion B-flat, similar to a saxophone, An extra key operated by the second finger of the right hand to facilitate C-natural to C-sharp and G-natural to G-sharp trills.