An email contact has asked me about this patent by a relative of his. He thinks it may have been made by Billings & Spencer, but Cope doesn't think so, and DATAMP doesn't have it. Google patents and USPTO have the patent but no maker listed.
Patent # 804600 by David Harris of Coulter, "Be it known that 1, DAVID HARRIS, a citizen of the United States of America, residing at Coulter, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Wrenches, of which the following is a specification, reference being had therein to the accompanying drawings.
This invention has relation to wrenches of that class wherein a movable jaw is provided that slides upon a toothed shank, wherein means is provided for holding the movable jaw in its adjusted positions.
The invention has for its particular object the provision of a movable jaw of novel construction, and has for its further object the v provision of novel means "for permitting of the rapid and easy adjustment of the movable jaw upon the shank and of novel means for sustaining the movable aw at any position to which it may be adjusted."
I suspect B&S bought the patent but never used it.