Mullard 10 pin 100 kcs circuit block 2.IA B8 940 02 (yellow), with plastic pin cover. 1965 Mullard circuit blocks, 1965. 1965
Mullard 10 pin 100 kcs circuit block OS1 B8 950 01 (green), with plastic pin cover. 1965 Mullard circuit blocks, 1965. 1965
Mullard 100 kcs circuit block. FF1 B8 920 00 (red) x 4 on printed circuit board, 1965 Mullard circuit blocks, 1965. 1965
Mullard 10 pin 100 kcs circuit block 2.2N1 B8 930 01 (orange), with plastic pin cover. 1965 Mullard circuit blocks 1965