Sweet chip!! As far as I know that is the name of the club, the street number. Plenty of clubs went by street numbers. Classic Chicago mob chip. Another example would be the 633 club in Newport which was called the Flamingo Club, but all the chips are 633. It also if I remember right was called the Chesterfield Club, owner was Lincoln Fitzgerald. Closed sometime in the 40s, but I do not know the exact time. I would think if you could go thru the Chicago newpapers, there would be maybe more information.