Found another Pickett 12"er at an estate sale, a model N902-T Simplex Trig. Got it for basically free (as it was part of a small lot we bought). Got it just for parts, as it has some issues (Dirty and chipped finish, missing screws, damaged cursor, broken cursor spring). But then upon research discovered it was a 1949 magnesium bodied trig model, so might just try restoring it and using it.
It also has instructions on how to use it embossed on the back.