I'd never seen this blocks puzzle before and love the simplicity and clarity of the design. I've rarely met a modernist sort of color learning toy I didn't like and this seems a scarce one--good for the design collection, and for very young kids!
12" x 8" x 1", good condition. A bit of staining (maybe a red marker line) along the bottom edge of a couple of the blocks--not visible when laid in the puzzle, but visible when the blocks are removed and viewed from the side (4th photo). No real matter!