U.S.M.CCustom made, by hand. Each one is different. The base material is from a stash of cotton canvas that I salvaged (Yes, with permission) from the darkest recess of an old stone church basement. The building was erected in 1876, and looked like it had been abandoned and neglected for years. The olive wool felt was purchase at a surplus auction from a former government military contractor and had a packing slip tucked inside dating to the early 1980's.