That sign sold for $789.95 + $23.95 shipping on Ebay on oct. 25, 2012.
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190659687310You know if you paid below that price, then the sign is most likely a reproduction.
It has picked up some more scratches since that date.
Here is a good source for Ford signs:
http://jerseygaspumps.tripod.com/ford.htmlLook 5 signs down and half way down the page again. You can use them for reference.
Yours looks much newer than those. The colors and fonts are wrong. Not to say that they couldn't have made a newer version of that sign. I have seen 1 other.