Hi-
These were made as inserts in tobacco packs. There are many different types. Most were issued between 1910-1915. Bob Forbes posts frequently on the Nonsports Forum (the icon is on the top right corner of this page) and he is an expert on these leathers. He also is an author of a book on nonsports tobacco cards. I would suggest searching the Nonsports Forum, and posting there if your questions cannot be answered through the search. That forum also has an incredible gallery that shows many different nonsports cards, and I believe there are pages for this type of leather insert.
Yours in collecting,
Alan Elefson
aelefson@hotmail.com