This behemoth is a 5x7 card numbered to just 5 copies (lower left corner). Found this the same day as the 1956 Topps Checklist.
Here's a handy size comparison with a 65th Anniversary stamped Kennys card.
The same seller also had this 5x7 from Topps Heritage, this time numbered to 10 copies. I don't know how many people out there collect Kennys, but I am definitely in the target market for this product.
Compared with a Topps Heritage Base Card
