It is fairly common for the 1976 to be missing stars and parts of "Independence Hall" I have a small collection of them somewhere. Grease is the cause of most of it. Yours isn't particularly striking, as only 1 star is completely missing. The vary from having 1 device affected to pretty much all of the stars and "Independence Hall" missing. The most I personally have found Is missing all but 6 starts and most of "Independence". They are fun, but I'm fairly sure they don't sell for a premium.