Super Scarce and Very Excellent Vintage "Bill Blocks" (3 Varied Boxes Worth)These blocks are beautiful, and way cool, and with excellent graphics on the box, too. I have done a good bit of searching but can only find one mention of them out there: there are a few boxes of these held in the collection of the National Building Museum in Washington, DC Boxes, though with no more information about them than I've got. The museum describes them as stone, which is what they seem to me to be (as if the lynchpin between antique stone