Some years back I saw a Lefever E, probably EE, grade 30" Krupp, straight grip 12ga with no safety. There was no visable sign of the slot having ever been cut in the top tang for one. Unfortunately some idiot had totally ruined the wood, by heavy handed sanding, rounding off every fitted corner, & after re-installing it had filled every "Large" gap with some form of wood dough/plastic wood, which wasn't evan a close color match. It was priced as if it were mint at the time, so I left it on the rack.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra