I think its a Lincoln Chordmaster. Its all I can find on it, found a few that looks similar.
Vintage 50s 60s Lincoln Selmer London trombone mouthpiece exc carrying hard case
Planet Waves Chordmaster - Hand Held, Touch Screen, Guitar Chord Computer.
FIVE EIGHTEENTH CENTURY PIANO SONATAS LINCOLN
Selmer Lincoln Trombone (dented Bell)
VINTAGE 1950 vintage Holton Leblanc TR602 TROMBONE Mouthpiece & Case 4789
Vintage 1975 Bugs Bunny | Percussion Set | Rare Find | Vintage Home Decor
