Christina O , former superyacht of Aristotle Onassis , up for sale . Onassis wed former Monaco first lady Jackie Kennedy on board luxury vessel . Expected to fetch $ 45 million when goes on sale in 1950s . Backdrop to lavish 1950s parties , attended by Aristotle Onassis , Jackie Kennedy .
Christina O , former superyacht of Aristotle Onassis , up for sale . Onassis wed former U.S. first lady Jackie Kennedy on board luxury vessel . Expected to fetch more than $ 32 million when goes on sale in mid-August . Backdrop to lavish 1950s parties , attended by Marilyn Monroe , Frank Sinatra .