Here pictures of my cast wing nut adjustable wrenches. The first three are marked: "B", "Belmont" and "Buckeye". They are exactly the same wrench with different markings. The next two are the "King" and "Star" which have been seen in two or three sizes each.
The star is a combination wrench and pliers. First three show up in most large antique wrench collections, the last two hardly ever.
None of the usual sources list a manufacture for these wrenches but because they are cast I would definitely
rule out Bonney and Bemis & Call. Probably a casting company like Eberhard or Pratt made them for other companies.
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/wingnut-adj-wrenches-690px.jpg)
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/king-wingnut-wrench.jpg)
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/star-wingnut-wrench-pliers.jpg)