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Todd Schultz...and they are attractive. Issued from late 1917 until 1920, they can vary a little in size. I sold a couple a little while back and saw some bidders from this board, so I know a few guys here collect the set or the type. A few of the pics are used in later sets--Schalk, Sisler and Speaker come to mind.
They are very hard to find in high grade, mostly due their thin stock being susceptible to creases. They are out there, though, often miscategorized as photos on ebay because of the blank backs and lack of identifying marks--other than the FM that most people don't recognize and which is lacking on some of the cards.