It does appear this was done a long time ago. There are no cracks on the 2nd side. Regardless of the issues this still is a very cool sign and would look great hung up high in a shop or on a pole. Obviously, it needs to be all redone and have lighting added to make this light. These are hard to find.
Please closely examine the photos to see exact condition. The item "Vintage CHEVROLET CHEVY OK USED CARS Lighted AUTO Dealer OIL Advertising SIGN" is in sale since Friday, August 9, 2019. This item is in the category "Collectibles\Advertising\Automobiles\American\Chevrolet". The seller is "bwild99" and is located in West Union, Iowa. This item can't be shipped, the buyer must pick up the item.