Got a set of these 6-point sockets in an ice cream pail full of New Britain, SK, JCPenny, etc.. sockets from an estate sale, but i can't find a name, logo, or COO on them for the life of me. Oddly the sizes end with an N. I'm new to vintage tools but have been scouring alloyartifacts to try to find some info. Maybe these are just some random no-name, but the N is weird.