I finally got around to cleaning the 10 bolt Posi that came with the race car, it had been shoved in the corner awaiting it's turn.
Anyway I pulled the cover, 3.08 posi unit still in good shape, I pulled the plug, it had a tag on it covered in crud. I sprayed it with brake cleaner and it's an original perfect condition Red Posi Lube tag.
Not a spectacular find, but fairly rare on a car passed around and raced so many times.

I'm not entirely sure what year or model the rear is though. Where do I find the stamped numbers?