Scientific American, may 30, 1885 lists Jas. Clayton, Brooklyn ,NY as a maker of air compressors and rock drills....
Seeger and Guernsey's [mining] cyclopædia 1899 lists
The Clayton Air compressor works, NY, maker of rock drills...
(Other references show they made large duplex compressors, but, i dunno if they are the same Clayton, or if your wrench has anything to do with it, but it is a start anyhow......
(The Clayton Air compressor co was bought by the International Steam Pump Co ,NY, 1902 - Railway Age)
Based on a patent, Jas. seems to be James...(at least as regards air compressors)
[Which gets me an entry in The Trow 1901, James Clayton was the principal of Clayton Air Compressor Works, Cortlant st, NY]
So, the only question is, is the Clayton on your wrench the same Clayton.....