Heinz Mack (Lollar 1931 – lives in Mönchengladbach). Untitled. 1961/62 Brush and India ink on paper. 52,2 × 41,5 cm (20 ½ × 16 ⅜ in.). At the top in the centre with chalk in white signed and dated: Mack 61/62. [3366] Provenance: Private Collection, Switzerland (acquired at Galerie am Lindenplatz, Vaduz)