Small Buhl wrench about 5 inches long, no size markings at all but measures up about 7/16th X 5/8th. The only markings are the letters BS over 72s over the letter R. Did Buhl make British Standard sized wrenches? When I found this wrench it came with a Made in England wrench with a snail logo on it (which I've found out is for Thomas Smith & Sons), and a small Triumph motorcycle wrench.