Cast bronze multiple.

1964/1967

2 1/2 x 2 1/2 x 3/8 in. (6.4 x 6.4 x 1 cm)

With incised signature, date '64' (the date of the original lead model from which the cast was made), and numbering 10/100 on the underside (between 1967 and 1979 the International Collectors Society, New York, issued 60 examples in bronze, 30 examples in stainless steel, 70 examples in sterling silver, and 12 artist's proofs in each metal; with the permission of Duchamp's widow, the edition was completed posthumously in 1981-82 to the editions of 100 each).