Here's an excellent recent purchase. In 1922, penny arcades, candy stores, and toy stores offered uncut picture strips of 10 baseball players, each picture being 2" x 3.5", or so. Then kids would slice em up, get them covered in filth, and put them in a shoebox, only to be unearthed by idiots like us a century later. The cards have a blank back and they're fairly thin, but not paper-thin.
As for Cliff Markle, he pitched for the Yankees in 1915, 1916, and 1924, and for the Reds in 1921 and 1922. His best year was 1922 when he pitched in 25 games (14 more than any other year) which included 16 starts, a 3.87 ERA, and a 4-5 record. This is one of only two cards of Markle, the other being an American Caramel release from the same year.