I have a vintage 1940's Corneli sign in great shape currently listed on eBay. Ebay listing for Corneli sign
I just picked this from Missouri on a roundtrip from SC. The Corneli company I believe was bought out or closed in the 1960's. They were a supplier of seed to the midwest often found in the early 20th century. By the 1950's their main business was soybean and corn seed.
The sign itself is made of the very thin bright tin common to the 1930's-50's that had the dimples to make it flashy when hit by light.
Asking $250 plus shipping.