This is a very rare, clean, straight adjustable wrench marked, "BUHL SONS CO." on the adjustable beam. It is questionable, but some say the actual name was Buhl & Sons Co., but anyway, they were located in Detroit MI. This one is 4" long, it is straight, has a straight handle, the jaws align nicely, and the adjustment is in good working order. There is some very minor pitting, on dimble like ding on one side and noted. The jaw edges show very minor wear. A very collectible small adjustable wrench, the first I've seen by this early 1900's tool maker!