Record matrix (nickel-plated copper) with die-cut hole, felt pads stamped with brown paint, in box,

1973

14 1/2 x 14 1/2 x 2 in (36.8 x 36.8 x 5.1 cm)

signed and numbered 50/77 in blue ink on the label affixed to the front of the box (there were also 7 artist’s proofs in Roman numerals), published by Edition Schellmann, Munich.