Not that many of you are looking to buy a real NOS billboard from the early 50s, but, about 4 dozen real ones are now at auction, here's a couple as examples

 

https://check_the_oil_promotions_llc.liveauctioneers.com/catalog/350993_amazing-automotive-and-advertising-billboards/

It's remarkable that any of these survived the last 70s years, but that there are so MANY is astounding to me. 

Anyway, I figured you'd get a kick out of seeing that there are a bunch of real 1949-54 billboards up for sale