Twice signed, dated, titled, inscribed "Vibration, mack 59, MACK, oben" + two directional arrows (on reverse)
Hand embossed aluminum on masonite board
37 x 44.5 x 2.5 cm, 14 1/2 x 17 1/2 x 1 in (unframed)
47 x 54 x 7 cm, 18 1/2 x 21 1/2 x 3 in (framed in acrylic glass case)
