Primarily Petroliana Shop Talk Forums Non-Petro Discussions Non-petro Discussion and Showcase Arizona hwy 89

Anyone hear knowledgeable on road signs? I picked this up the other day thinking it was hobby lobby junk…. But after picking it up & checking it out it’s really heavy metal & not thin tin…I’ve tried a bit of research & haven’t found anything, except there were none on EBay!! I’m leaning towards an old original? Anyone help me out with maybe dimensions of an original? If there even is such a thing.