This wrench is from Wrench Roll Set #1815 - Metric Combination Wrench Set - 8MM - 22MM. According to the previous owner, these were bought sometime in the 1970's and were used very little. The Roll is labeled S-K Tools and bears the Dresser Industries label. We cannot be sure (except for the 8MM wrench which does not belong to the original set) if all wrenches are original to the tool roll. Some are marked simply S-K and some are marked S-K Tools on the shank. This wrench possesses the date code at the open end of the shank as well as the "T" stamp on the box end shank, and is marked S-K on the RP. This wrench also bears a "A" stamp just below the 2-letter code.