Black & white, blank back, the Photoplay Favorites Supplement from the North American measures 6-7/8" X 11".
I've now seen 10 of these, 9 are shown below. These are numbered with 10 being the highest number I've had, and thus the size of the set until I see something number higher. Issued bi-weekly then weekly by The North American, January-March 1917. Each Supplement is dated in the bottom border.
Just click on any thumbnail below and it will open up a full-sized image--from there you can scroll through the entire gallery of nine images:
1917 North American Photoplay Favorites Supplements Checklist:
1 - Mary Pickford - January 14, 1917
2 - Clara Kimball Young - January 28, 1917
3 - Pearl White - February 4, 1917
4 - Marguerite Clark - February 11, 1917
5 - Theda Bara - February 18, 1917
6 - Anita Stewart - February 25, 1917 *
7 - William Farnum - March 4, 1917
8 - Pauline Frederick - March 11, 1917
9 - Grace Cunard - March 18, 1917
10 - Ruth Roland - March 25, 1917
* Anita Stewart, #6, spotted in a March 2012 eBay auction.