I’m curious if anyone knows if this is a legit sign and, if so, if it is from the New Jersey oil company, Guardian Oil Co?

https://www.ebay.com/itm/VINTAGE-AD...CREDIT-CARD-PORCELAIN-SIGN-/303206574692

6229F144-D00A-4948-9556-25D0AB91AA33.png

Looking for NJ oil company related items (Mohawk, Guardian, Whiz, etc), Invader, Bulko and Freedom items, and foreign Gargoyle and Sinclair cans