So, around 1950 Plomb stopped being marked PLOMB?
I think 1948-49 was the transition period.
1949. See 'Plomb - Lawsuit Research' thread in Sticky for more.There was 1 year that tools we're dual marked proto and Plomb often referred to as the transition year.
I just looked through my sockets and found six S-K Chrome. When were they marked chrome or was S-K Chrome a higher grade than the others?