Matrix variation 1: Matrix A: TI MK-78-A-1 MASTERDISK RL Matrix B: TI MK-78-B-2 MASTERDISK RL (etched, MASTERDISK is stamped)
Matrix variation 2: Matrix A: TI MK-78-A-1 MASTERDISK RL Matrix B: TI MK-78-B-3 MASTERDISK RL (etched, MASTERDISK is stamped)
Matrix variation 3: Matrix A: TI MK-78-A-1 MASTERDISK RL Matrix B: TI MK-78-B-3 (etched, MASTERDISK is stamped)