I have a 4 inch adjustable wrench with the same markings "Jamestown, NY" and "Made In USA" with no brand. I'm searching for who made mine as well. Crescent wasn't the only manufacturer of adjustable wrenches in Jamestown, NY. There was also Proto, JP Danielson, Wm Hjorth & Co, Jamestown Metalsmiths, Jamestown Specialty, and possibly others.