Have no skin in this sale, but for those "get em all" guys like me, curious of your thoughts. Looks like it is from a check, although no known checks exist. I see some Philadelphia markings on the back, which is not far from Newark. Seller claims it is from a 40 year old in collection from California. Signature looks spot on. I am ignoring the PSA, and the price for that matter (about twice as much as I think it would sell for at auction).
http://www.ebay.com/itm/Vic-WIllis-S...item19fc6ec1c7