Late '60s, early '70s 204S.
However, it's technically a free knife. It was supposed to be an older 204 in cocobolo. Seller said she would mail me the correct knife tomorrow; and I would not have to return this one at all. I am guessing this may be partly because I noticed it had somewhat lazy snap on the screwdriver (I think a clean-out will fix it) and the lock is pretty badly mangled.
I emailed one of the mechanics here about having it cut-down into a one-blade, but for the time being, it will join the cocobolo 204S with badly pitted blades in the user pile. The woodgrain Delrin shouldn't be as bad as black Camillus Delrin when my hands are sweaty, wet, or soaked in oil/grease.
Camillus are really outpacing Schrades as users--I've now retired almost all my old Schrades, and that's something that needs to change. This ain't a shelf queen in the condition it's in, and I can use it without qualms.