J. M. Hays Wood Products Co. was the saddletree factory that was located at the Missouri State Penitentiary from about 1878 to 1918, known as the J. S. Sullivan Saddletree Co. prior to 1912. J.M. Hays was the son-in-law of the original owner, J.S. Sullivan, and the general manager of the plant for many years prior to buying his father-in-law out.
They were THE major producer of saddletrees in the US from the 1880s through WW1, and put a lot of folks out of business with their low-priced prison-labor products. Canada actually prohibited US saddletrees (among other prison-made products) from being imported for this very reason. In their 1911 catalog, they boasted about the hundreds of styles they could make, and the many countries around the world they shipped to.
They made a quality product - it's just the source of the cheap labor that caused them issues. They provided VAST numbers of saddletrees for WW1 contractors, so you find these paper labels in many old surplus saddles. The Missouri Assembly finally booted the prison labor racket in mid-1918, and that was the end of the saddletree business. Immediately post-war, Hays took the tooling and looked for other wood products to make, and ended up making toys and then duck decoys. Very high quality, and highly prized these days, as they only lasted for a few years before finally folding up.
Todd H.
https://www.militaryhorse.org/