A documentary I am watching sparked this thread topic. Also, an interesting thing, the Arkansas State Police (during the 60's) wore the state silhouette as a badge rather than the 6 pointed state we see today.
I didn't want to subject this thread to restriction for interstates or US highways, because they are more known across the nation - than say, a specific state's local highways. But, with that said, have at it!
I-40 E/W Signage (https://youtu.be/0XaHyldDU10?t=2199)
Also, within the same video:
A concurrency with US 65 and an unreadable AR silhouette (https://youtu.be/0XaHyldDU10?t=3230) (it's 41* something -- Or, rather than me make assumptions, I don't know what it is. But, I have been looking for something similar on GMs) What era were the Arkansas cutouts, again?