This is the first I ever heard of a Minot's thumbnail. Don't think one exists, I think the confusion is that HL goofed and doubled up on a product number as Grace noted. HL 646 is the Minot's special piece, the one with the lightup wave.

Grace has all the thumbnails listed as far as I know, but there are others far more knowledgeable than I.

The nine thumbnails for the Reunion were my choice.