The "S dot K" logo puts it in the FACOM era (1985-2005) and possibly later. If that helps anything.
i mostly agree with that as tuff 1 rats and some other pieces had a different logo than the standard s-k logo. but........ that custom line is pre facom. the custom and or peg pack stuff goes back to late 70's or around early 80's, i know for a fact that i filled in some gaps with peg pack singles in 1984, my first year of college and i know they were not new then. i still have those sockets.
that "custom" ratchet was available as a peg pack single and the "frankenstein" ratchets came with the sets from that same line. my frankie laying on my desk has that same logo and i am positive predates the facom era.
if you notice, the custom ratchets have a black cap and black anvil like the frankies do. the imprinting on the drive end also gives it away as being made earlier as well. i doubt any of the facom era production had that.