Old metal enamel signs

Wow, those signs are awesome!!! I have never seen a Sphinx sign before, must be worth a lot! I have a bunch of Mopar dealer signs but its mostly from the 50's-80's, like the lighted signs and outdoor signs. My dad has some older signs but only buys them when we can get a deal, most are very expensive. Some of the repop signs are cool, but not old so we don't collect too many of them.