Seneca Cameras, Seneca Camera Mfg. Co., (Rochester, NY), Catalog M, dated 1913, ~5"x8", 76pp

From 1906 through 1913, Seneca apparently had a policy of producing their catalogs at the frequency of one per year, naming them using consecutive letters of the alphabet, and usually dating them as well.  This is the last dated catalog until 1919.  Despite being admonished to destroy catalogs (see inside back cover), many Seneca catalogs have survived in a condition as if never opened, such as this one.  This example also came with two folded flyers, scans of which are provided after those of the catalog pages.