My new project truck - found neat original equip

[Mountain Man]

Found out new and interesting stuff on my project 72C10 Custom Deluxe today.

I was ripping out all wiring to install a new Painless wiring harness and fuse block and found some stuff I did not notice when I bought the truck, as it was so full of crap.

#1 - still has original jack stowage decal on back of cab, AND the ORIGINAL JACK is still in its place! Is this worth anything?

#2 - there is a very original looking valve knob on the floor just in front of the bench seat. It turns a quarter of a turn, and back. What the %^&## is it for. I will go under neath tommorrow when I run the new wiring to the tail section, but thought someone may also have one of these.