Cleaning a friends barn and found two bottles of this. We used to have to replace center carriers on 9" Ford rears for "chuckling" noise and got two bottle with each kit. Found two left over rear end hypoid gear oil for open rear
I used to have several NOS Ford ring & pinion sets. They came in a neat box with two of those. I still have one left. I think mine is about 5 - 10 years older than yours.
Definitely older, the ones we had are from the early 70's.
It's sort of neat finding this kind of stuff , lots of memories