The complete set of four offset lithographs (one also with brown, one also with purple), on Schoeller-Turm board, with full margins,

1972

all I. 12 7/8 x 17 1/4 in. (32.7 x 43.8 cm)
all S. 16 1/4 x 23 3/4 in. (41.3 x 60.3 cm)

all signed and numbered in pencil (the edition was 100 and 20 in Roman numerals), published by Edition Staeck, Heidelberg (with their blindstamp), all unframed.