An early Springbok art puzzle, Convergence #M25, by Jackson Pollock. It has 340 pcs and is complete, from my own collection. 

The box is a split top, where the lid only comes down halfway, very good condition. Included is a rolled up 13" x 20" poster puzzle guide, a Jackson Pollack brochure, and a puzzle tips slip.

The pieces are in excellent condition, glossy, no musty odors.

Contrary to the printing on the box, it's not the world's most difficult puzzle.