Although Playboy magazine officially uprooted its Chicago offices to head west for Los Angeles last month, the magazine has left behind several relics, including the little black book that once belonged to its legendary founder Hugh Hefner.

Last Friday, the Chicago History Museum unveiled its new display of Hefner's address book, part of "Unexpected Chicago," a rotating exhibition that changes every two months. The lore of the book, the museum notes, "implies a secret world of go-to contacts -- actual names or pseudonyms -- its user has cultivated and maintained." Such a lore, at least in non-digital form, is rarer today. The book was modified to cover the names and addresses of the people listed inside.

The museum also features a number of Playboy relics as a part of its "Crossroads of America" exhibition.

Of his company's Chicago farewell, Hefner, 86, wrote fondly of the city where he spent his college, Army and early Playboy magazine years, calling it "the most significant representation of true, post-war America."

Today, Hefner lives in Los Angeles and the Streeterville building where his company was formerly headquartered has been subleased by the Chicago's Children's Memorial Hospital to house its foundation, finance and legal departments.

All images appear courtesy of the Chicago History Museum. Click here if you are interested in obtaining a copy of any of the museum's images included in the slideshow. Their call numbers have been included for your reference.

Loading Slideshow...
  • The Hef's Little Black Book

    Now on display at the Chicago History Museum.

  • Inside the Black Book

    Accompanying the book is a pick message slip that has a "While You were away" message that spells out Hef's room number and the fact that she told the operator that the message is "not urgent."

  • Hugh Hefner

    Hefner, publisher of Playboy. (i40391)

  • Playboy Club bunny costume, cufflinks

    In 1972, Playboy Corp. created this costume to fit the figure of 23-year old Suzy Leigh. With measurements 37.5-23-32, 5'2'' tall and 98 pounds, Leigh had the ideal Playboy figure.

  • Playboy Club bunny costume, cufflinks

  • Bunnies on duty

    Photographer Stephen Deutch captured Playboy Bunnies on duty at the Playboy Club, Chicago, c. 1960. Gifts of Stephen Deutch (i23629)

  • Bunnies on duty

    Photographer Stephen Deutch captured Playboy Bunnies on duty at the Playboy Club, Chicago, c. 1960. Gifts of Stephen Deutch (i40392)

  • Playboy Club Bunny Costume and Cufflinks

  • Playboy Club member key

    The key card was issued to Howard E. Hight circa 1970.

  • Playboy Club swizzle sticks

    (Used in the Chicago Playboy Club Circa 1960-1980)

  • On display at the Chicago History Museum

  • Hugh Hefner Talks About The Playboy Club

    Iconic Legend Hugh Hefner talks about the new show The Playboy Club on NBC.