(OB-729) Serigraph #15 in "The Angles of Open Form Infinite Space from Cinètisme to Open Form 1949 - 1968" Edited in 1968 in New York, Paris and Stockholm. Edition limited to 300 albums. Each serigraph numbered 1 to 300, signed by Baertling. L-3 sign 8st, L-G sts 1st, F-9 sign 1st ram (HD plac. 19 april 2018, tidigare lån Setterwalls adv.byrå).