This is a late 20th century, dated 1991, signed and numbered offset color lithograph print by the commercial and corporate artist, Zoe Mac. Mac trained at the Art Students League in NYC under the illustrator Mario Cooper (as an aside, I was acquainted with Mario's wife and sold his works for her). This print is one of 1170 produced of the image entitled 'Piece for String'. It is part of the Roman Numeral numbered edition and is 53/450, or LIII/CDL. There were 6 subsets or tiers of numbered editions of this same image, however, realistically, they really all have the same fair market value in general. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.