I think its a Lincoln Chordmaster. Its all I can find on it, found a few that looks similar.
Trumpet Vintage Lincoln Selmer Brass With Hard Carry Case
Vintage Lincoln Selmer London trombone With 2 mouthpiece & carrying hard case
Vintage Lincoln Brass Trumpet Circa 1959 Made In England with Case
Vintage 50s 60s Lincoln Selmer London trombone mouthpiece exc carrying hard case
Trombone By Lincoln
VINTAGE 1950 vintage Holton Leblanc TR602 TROMBONE Mouthpiece & Case 4789
