Champion Spark Plugs Advertising Clock Sign Auto Gas Oil scrolling

Selling a older Champion clock with scrolling messages.
Battery powered clock and scroll movement.
Made from plastic, so not super old, but still cool.
The bottom message area scrolls up and down in about a minute or so.
The piece of metal that slides up and down with the message, sometimes gets "stuck"
Looks like it had some old grease to lube it up?
I tried some dry lube and it helped the sliding issue a lot.
The clock takes a C size battery NOT INCLUDED
The scrolling movement takes 2 D batteries, NOT INCLUDED
The entire piece is roughly 16x12x4 inches
The sign does NOT light up.
The clock does NOT keep good time
Note missing paint area below the text "tune up with" The last two pictures show an additional plastic sign that looks like it was intended to cover up the scrolling sign area?
Maybe it was done by prior owner or Champion because of issues with the scrolling text sticking???
Please ask any question you have. Thanks!