I found this wrench last week in a flea market. Alloy Artifacts describes this wrench as rare and I agree, but auction prices do not come close to supporting that conclusion.
We know where the wrench was produced, Mansfield, Ohio, who the patentee was, J. Sisolak, and what the patent number is, 1,571,148, but not who manufactured this wrench. The Datamp patent extract, under "Manufacturer", reads "Not known to have been manufactured". Another bureaucratic error?