Jacqueline Kennedy-Onassis was undoubtedly one of the great style icons of the 20th century. On June 21, Christie's New York will auction a one-of-a-kind wristwatch worn for decades by the former First Lady of the United States.

One lucky bidder will get their hands on an exceptional watch, which was designed exactly 100 years ago, and has a place in history. 

This prestigious time-keeper was given to Jackie Kennedy-Onassis by her brother-in-law Stanislaw "Stas" Radziwill in 1963, and is engraved with the words "Stas to Jackie 23 Feb. 63 2:05 am to 9:35 pm." The time refers to the beginning and end of a famous 50-mile run on Palm Beach in 1963.

Along with the Cartier Tank watch, the auction will also include an original painting by the former First Lady for the same brother-in-law. While the watch is estimated to fetch up to  $120,000USD ($168,440 SGD), it seems likely that it will go for a much higher price. We'll find out on June 21.

(Related: 5 Inaugural Gowns We Love From America's First Ladies)