I am interested in buying some old gas signs. I found this forum maybe someone can help. There is a seller redhatrelics on ebay that is selling a lot of signs. Are they real? https://www.ebay.com/sch/m.html?_ssn=redhatrelics&_sop=10

They all look the same. It seems strange to have a date on so many signs yet they all appear to have same wear. Can anyone help me out? Thanks in advance!