Nimble Words

Crossword dice game. 13 cubes with one letter on each face, except one blank face on one cube, with a plastic cup. Letters have values similar to Scrabble. The box says "No. 143" Kohner probably released this at the same time as their Tumble Words (which has dice in three colors, without values, and has "No. 142" on the box). The company address has no ZIP code, so it's probably from the early 1960s if not older.