Above, a Westcott adjustable wrench made by the Keystone Company. Originally produced by the Westcott company, it was made by Keystone from about 1900 onward.
Above, the only other Keystone tools I've ever picked up in my area.
Dating back to at least 1883, the Keystone Manufacturing Company of Buffalo produced ratchets, ratchet drills, adjustable wrenches, and socket sets. No idea what happened to it.
Images below from Preservation Ready