156. 156AR SAM FRANCIS (1923-1994) Metal Line (SF-120), 1971 (Lembark, L.120) Lithograph on BFK Rives vellum Signed and justified "TP I" (Trial proof) Unique colour trial outside the edition of 19 copies Published and printed by The Litho Shop, Inc. in Santa Monica, California 88.9 × 63.5 cm Lithograph on BFK Rives wove paper, signed and justified "TP I"