SONIC BOOM Octaves (Very rare pair of test pressings for the mail-order orange vinyl 2-track 10" from the 'Spectrum' LP, one on BROWN SWIRL VINYL and one on WHITE VINYL, both with unannotated plain white labels and etched matrices, includes Tremelos, plain paper sleeves. Both discs show just a little light cosmetic wear with an area of paper loss to the centre of the brown vinyl label & a little discolouration, whilst the labels for the white vinyl show little wear. A fantastic pair of discs, the like of which we may well never see again SONIC1)