67 Rear Brake Drum Question

[455hota]

I am getting into the mechanicals on my 67 Fordoor. I have removed all the wheels, as it is lifted up on my hoist.
I noticed the rear drums appear to be original.

There is a green tag on each rear drum.
The tag reads KH-49374
I am thinking the KH stands for Kelsey Hayes, the brake supplier to Ford in 67.
Can anyone verify if they have seen a similar green tag?
My Fordoor has 49k miles on the odometer and the history I have indicates that to be correct. In this 80’s the car was titled in WI with 47k miles. It has sat since 89 in a garage , so I think these are original drums. Just looking for confirmation.
PS the gray stuff seems to be anti seize applied earlier in its life.
Thanks... Steve