CHICAGO – Potter & Potter Auctions will hold a sale of more than 500 lots featuring the circus archives of John and Jan Zweifel as well as the Museum of Science and Industry’s entire circus exhibit, many elements of which have been on display at the beloved Chicago institution for decades. The auction will take place on Saturday, September 24 starting at 10 am Central time. Absentee and Internet live bidding will be available through LiveAuctioneers.