Seam Racer has a nice post about these here.
I haven't found anything more. They were offered from 1927 through 1941 and were aimed at young adult women.
Announcement, December 1936
I have not found a T-8500, if there was one. Here is Campus Modes T-8501 from January 1937
Campus Modes T-8503, February 14, 1936
Campus Modes T-8504, February 21, 1936
Campus Modes T-8505, ad dated September 09 but was probably released in early March
