Vintage Budweiser Pictorial Sign

I found this in the attic of a friends house last night while cleaning. It belonged to my friends' husbands' father. He's had the sign sign he was a kid, and from the looks of it, it could be dated anywhere from the 1950's-1960's. My friend would like to sell it because they are moving and trying to rid themselves of clutter, but I have NO IDEA how much this would go for. I've scoured the internet for information on it, but can't seem to find anything other than an old eBay auction for a sign like this one that ended back in 2007. Anyone know anything about this sign?

Here is what the back of the sign reads:
Item 005-211
Budweiser back bar pictorial sign
Produced by price brothers, inc. Chicago, IL
Union made fabricators