Dates based on Madison Plow Company operations, as per http://www.historicmadison.org/Madison%27s%20Past/Places/Walking%20Tours/IndustrialTour2.html (accessed November 2017).
Metal wrench. One end has one head that is 2.8cm wide, the other end has two heads, each approximately 2cm wide. "G70" stamped on one side.
History Of Use
G70 wrench is listed in Madison Plow Company for their wood and steel frame transplanters, cultivators, planters, and disc harrows. It is only one of two wrenches that have been attributed to the Madison Plow Company. (Source: http://www.wrenchingnews.com/sell-page/sell.html, accessed November 2017).