Independent label: Mortonsound Records was the label of the recording studio of that name, from Newcastle-upon-Tyne.   Throughout the '60s and '70s it appears to have served as an outlet for recordings made by Club / Cabaret / Amateur acts, issuing a number of records in small pressings.  Numbering was in an MNT-3000 series.  The label's main claim to fame seems to be that it released the first single by Punk band Blitzkrieg Bop, 'Let's Go' (MTN-3172) in July 1977.  The single brought the band to the attention of Lightning Records; they re-recorded it for that company, and the results were issued as GIL-504 in December of that same year. Distributed By TS Records. Thanks to Robert Lyons For The Info.

77 Blitzrieg Bop Let'S Go MORTONSOUND  MTN 3172 / 3173