Caterpillar sign

My son bought a caterpillar sign on a auction awhile back and was wondering if it could have been from a dealership. I'm sure it was from a lighted sign as he only got the front part that said caterpillar. The sign read up and down (vertical) and just guessing is maybe 6ft tall. Outside is black and the letters are yellow what the light would shine thru. It was an estate sale and I know he worked for Caterpillar in the late 50's and into the early 70's, they built a new building in the 60's so thought maybe he got it from the old one. My question is have any of you seen a vertical sign that was lighted up similar to this. I know a picture would help but I don't have one yet.

Do you have any pictures of said sign, it may help to jog some memories if there was an image of it.

Cheers
Nate