No manufacturer is indicated on these 1-11/16" X 2-3/4" blank backed cards.  Each star's name is included on the photo by way of facsimile signature and the only other identifying features are the occasional inclusion of a photographer's or photographer's studio's name such as Witzel or Hartsook on a few of the cards.  Glossy finish, images more sepia than black and white.  The backs appear a little toned on the group that I acquired, but I believe they were probably white or a slightly off-white when issued.   All that I have seen are those I had purchased as a group, all of those appear here:

Beverly Bayne * (1 of 2) **Hartsook	Beverly Bayne * (2 of 2) **Hartsook	Gladys Brockwell **Hartsook	Mrs. Vernon Castle	Dorothy Gish **Hartsook
Elaine Hammerstein	Louise Huff	Bessie Love **Hartsook	Edna Maison **Witzel	Mae Marsh
Dorothy Phillips	Edna Purviance **Hartsook	Constance Talmadge **Hartsook	Norma Talmadge	Lenore Ulrich **Hartsook