Many years ago I was out for a ride on the Norton when I stopped at a yard sale. Digging around in a box, I found the above spanner, badly rusted and with a frozen and damaged screw that had obviously been the victim of a previous owner's attempt to loosen it with vice-grip pliers. I brought it home, cleaned it up, and had a machinist friend make a new screw for it.
I'd never heard of "The Original Clyburn" and so it remained a mystery until years later, on another Norton ride, I stopped at a local provincial park. As I was preparing to leave, an individual with a strong British accent came up to talk about the bike. He turned out to be an antique dealer on a visit from the U.K. and we had some email correspondence afterwards. He very kindly did some research for me:
"Richard Clyburn is first recorded working as a Consulting Engineer in the Agricultural and Textile industries in Gloucester and Somerset in 1828. Amongst his many other inventions (he made high precision tools with replaceable parts from both wrought and cast iron, preferring wrought to cast). He is credited with inventing the first adjustable spanner in 1842 and registering the design in 1843 whilst working as the Engineering Manager at the Uley Iron Works in Gloucester, which was owned by the Earl of Ducie. His design remained in production , mainly by other Birmingham factories, and appearing in tool catalogues up until about 1964."He sent me a copy of the 1964 catalogue entry below:
It would seem that Thomas Chatwin & Co. in England were one of the primary manufacturers of this wrench, at least as far back as 1884 and forward into the 1950's:
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