That's a monkey wrench. Presumably for very small monkeys.I am surprised that this unit hasn't appeared in this thread yet, so I'll take the liberty of posting this example from a recent ebay ad listing.
Both @Private Lugnutz and I own copies of this wrench, but ours are stamped "A G & J Product" (for "Gormully and Jeffery".)
I have seen various names stamped on this little wrench in different ebay listings.
I am of the opinion this unit was made as a promotional item and we still don't know who actually manufactured it:
Russ Darr Sporting Goods 3-inch adjustable wrench (photo: ebay)






