Christie’s mid-season Post-War to Present auction in New York brought in $21.3 million, led by strong results for Helen Frankenthaler, Ed Ruscha, Richard Estes, and Diane Arbus.

With the artist's incised signature and date on the reverse, numbered 30/30. Edition Schellmann incised stamp.

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Gallery Country stars' net worths: from Dolly Parton's eye-watering fortune to Keith Urban and Garth Brooks' ...