Yeah that explains it regarding the hinges. I always thought it was red oxide exterior and interior of the car, but keep noticing the inner panels having grey primer where the parchment paint is missing. Maybe under grey primer is red oxide on the interior, but where bare metal is shown on the inner doors, only grey and parchment color. Probably Factory or PO restoration. When I got the car it just had that original interior smell.
Thank You everyone for your contribution into this topic.