The closest thing I have seen to an original interior mirror was on a large military truck. I’m guessing it was 1942-44. Same art deco cab but military front end. Looking at the base coat of OD green, the mirror appeared to be original and stock. It Looked similar to the one pictured by Chev4t6 and was mounted to the panel above the windshield. Yes, you can see out the back with it and it fits nicely on my 39.
