My father-in-law was a civil engineer and worked in heavy construction during WW II at the Boston Army Base and then in Maine and Massachusetts through the 1970s. These metal advertising fobs were gifted to him and he kept them as momentous. They date from this period.

Two are from Caterpillar and the Perkins-Milton Co. Boston,Springfield. One is marked Koehring Heavy Duty and was gifted to him by The Parker-Danner Company in Hyde Park which was part of Boston. There is one that is marked Buckrus Erie that appears to be in brass. There is one from Link-Belt Speeder Shovels, Cranes and Draglines. There are two that are rusted. One is from Jaeger Distributors. The second is from International Harvester. I have not tried to clean any of them. Three have their leather straps intact but they are showing their age. I have not tried to open them. Everything is being sold as is and priced accordingly.