The clockworks mechanism inside the light does work so the image of the glasses does slowly change when it's plugged in. If I were going to keep this sign I would restore the bricks by peeling off a section of them, running it through a scanner, then use Photoshop to recreate that image across a whole sheet, cut pieces to fit, and reapply to the sign.
I think this could be accomplished pretty easily but I'm not going to take on that task in the event some collector out there would prefer to have it in its original condition. There are other examples of this item in far better condition but it is highly collectible so you're likely to pay a lot more.
The item "Working Vintage Hamm's Beer Starry Skies motion light lighted sign for Man Cave" is in sale since Sunday, March 25, 2018. This item is in the category "Collectibles\Breweriana, Beer\Signs & Tins\Hamm's". The seller is "smw3" and is located in Eureka, California. This item can be shipped to United States.