I do not know the manufacturer of that adjustable. I agree the “W” is probably a clue.
Bonney outsourced adjustable production. A major supplier was Utica, which also supplied pliers - for decades prior to Utica (Kelsey-Hates) purchasing Bonney from Miller Mfg in 1964, after which it is pointless to distinguish between “them” (nor Herbrand, nor Torque Controls after ‘68, nor Diamond after ‘81).
However, at times, or for specific tools, Channellock, Crescent, Danielson and others made pliers or adjustables for Bonney.
Adjustables with unreinforced hole have not been an area of interest to me, so I just don’t recognize it. The jaws are hex-head optimized rather than square-head optimized, as many Utica and Danielson/Proto adjustables were. Bon-e-con is probably from the 1950s, but again, that line has not been an interest to me.


I do have an adjustable that may be of interest, though. Bonney-branded, fully chrome-plated, presumably the same era as your Bon-e-con. Note the “F” where yours has a “W.”
It is not the style I prefer; I believe my grandfather purchased it new, so during the Miller Mfg years, when a supplier other than Utica seems most likely. Last pic is contrasted to the same model number in the Utica style.
