For some interesting reading about Craftsman tool history and related brands,
click here.
An excerpt from the link reguarding
Merit Brand...
" The Sears catalogs frequently mention "Merit" brand tools as lower-cost alternatives to the Craftsman selections, and the next several figures show examples of various tools marked with the Merit brand. The Merit brand is believed to have been a private unregistered brand used by Sears, rather than an independent company brand.
Interestingly, several of the examples below are marked with an "AF" code, a code also found on a number of Craftsman brand tools. This strongly suggests that the maker of the "AF" Merit tools also produced Craftsman-branded tools.
Some of the manufacturers of Merit brand tools have been identified by means of manufacturer's codes or by production characteristics, including Danielson, Diamond Calk Horseshoe, and Vlchek Tool."
-Xander