Centura!
I've seen these before, didn't know what to call them. Do they fit a "Decora" (GFCI) plate? The paint shield is a good idea.
I have one of those Edison-base receptacles too, although not of the never-used variety. Got it at an antique shop.
You know, "radio, lamp, bell, and telephone wiring" is not the same as "all inside wiring"!