This is what I was going to post for the benefit of beginners.Order a Vic's and a GPH catalogue.They both have pages and pages of repop and fantasy signs.If you can find someone who has kept a file of older issues,do it as their product lines have changed over time.

As has been pointed out,you had better know when the diminsions are the only thing to tell you the difference at a glance.That goes for 12"round as well as some pump plates.Buy the reference books,then you will know what to look for.

And,you can carry them with you to shows and auctions.JMO