Grain Belt Beer Aviation Sign

Would anyone have information on this cardboard Grain Belt beer sign that was handed down from my husband's family. When it might have been produced - thinking post war maybe 1940's. There is a stamp under the No 141 that I can't find any info on. Looks to be S.A. No 8 Union , then Lipaba Label. What would the No 141 stand for? I've search the internet and can't find anything like it. Would there be Aviation sites you could refer me to that might be interested in it?