Now theres something you don't see everyday... A Frank Adam wall plate (on the Hubbell outlet)

The top outlet is the precursor to the T slot Nema 2-15 outlet (the 2nd pic).

There's some sort of symbol on the face of the 1st outlet, but I can't make it out, enlarging it makes it look like kanji.

Here's a few I've come across...
https://www.electrical-contractor.net/ubb/Forum17/HTML/000082.html

PS.. Welcome to ECN [Linked Image]

Randy