I only have the slightest clue as to the origins of these high quality cards. They measure approximately 1-7/8" X 2-5/8" and have blank backs--except one of them didn't have a blank back, it had this:
Now I don't know if these are all from the same set or not but I do know that I acquired them together and that they're very similar in size, look and feel. They're on a thick stock almost reminding me of a mini-arcade card of sorts. I wish they all had numbering like the Gail Kane card, but unfortunately that's not the case.
Despite the Kane reverse being unique it's the only clue I have to go on, thus Movie Theater Handout in the title of this page.
My best guess at to the date of issue is approximately 1916-1917. Many of the subjects included in this issue are typical inclusions in sets of this period plus the inclusion of stage star Bertha Kalich, whose short film run ended with three 1916 releases, and singer Edna May, whose three IMDb credits are dated 1911, 1916, and 1928, seem to point towards the mid-1910's date as well.
There were a few stars with two different cards. Several have a photographer's studio credit in the image, most often Hartsook. A couple have a color tinting to them. All that I have seen are shown below.
The following gallery includes images of all 58 of these cards I have seen. Just click on any image to open to full size and from there you can scroll through them all.
Checklist of All Cards Shown in Gallery
Theda Bara (2)
Francis X. Bushman
Pauline Frederick (2)
Harry S. Hilliard
Gail Kane #16 with text on reverse
J. Warren Kerrigan
Anna Q. Nilsson
Mary Pickford (2)
Henry B. Walthall