Autox pretty much nailed it. What I find cool is in your 2nd pic it has the words "orange vinyl". Never seen that before! Very cool, its gotta be for a "Hang Ten" Dart. I believe only 74 and 75. Not sure if they ever made 4 spd ones? So the plate could have been modified from auto to 4 spd. But the base is definitely 4spd. Look close right beside the tape measure you can see a small screw/clip. That was to hold a molded hump that originally was installed from factory. Hump was there so it.could be removed to make adjustments to linkage etc.
View attachment 1715871645