What do you know about the distribution chain? There may be partial catalogs in some of the auto parts and hardware distributor catalogs from back in the early days that would help date some of the the markings.
Howdy John! Appreciate your words. What I know of the distribution chain is:
1) Source: family genealogy book written by Shurtleff. Confirmed with example tools. Exclusive private branding distribution in the first few years.
2) Source: Inserts in tool sets, and written testimony from a member in the know. Confirmed in example tools. Distribution was, at least, through "Farm Supply" stores.
3) Source: genealogy book again. Confirmed via NOS tool acquisition. US Government contracts/distribution during WWII and at least through 1984.
4) Source: verbal testimony of 16 "vintage" auto parts stores throughout south Arkansas and North Louisiana. Napa, Western Auto were the focus but some "home town" unbranded stores surveyed. 1 unbranded parts store, out of the 16 total stores, had an employee with knowledge of them being sold out of the auto parts store. Catalogs since gone. Last recollection of distribution through his store being in the 1970's.
5) Source: verbal testimony of "tool store" in business since the early 40s. "We could get Thorsen through our distributors, and they were represented in their master catalogs. We threw out several dumpsters full just last month cleaning up".
6) Source: 1985 Thorsen catalog. It has a "Weatherly Index" number printed on the cover. This implies formal catalog organization; such as within a parts store from my understanding. The catalog was addressed to ........ Supply Company, Wholesale Distributors.
7) Source: 1930s Thorsen catalog. marked as distributed by "Lerer & Son Automotive, Petalhuma Calif." I know nothing of this company as of yet.
That's all I know, and how I know it.