Dang...if it wasn't a 780 mile drive, I'd be over with some solid micro-brew, seeing as my JUST acquired Defender is lacking some of the coin door internals! lol
Testimony from other posts indicates that is an "Early" Defender coin door, making it grail-like for someone looking for an early door for their early Defender.
Later ones got the black "arcade game" door. The early ones got the silver "pinball" style door.