London - A lipstick print on a napkin left by Britain's "Iron Lady" prime minister Margaret Thatcher during a visit to the United States has gone on sale online ahead of Valentine's Day.
The curious collectible, a napkin from the Pfister Hotel in Milwaukee, has so far fetched bids of 1,950 (2,600 euros, $3,000) on the collectors' site Picollecta.
Thatcher, who former French president Francois Mitterrand once said had "the eyes of Caligula and the mouth of Marilyn Monroe", stayed at the hotel in 2000.
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She later travelled to give a lecture at the Ohio Theatre and the website said the napkin was "retrieved from Mrs Thatcher's waste basket in her dressing room by a theatre employee".
The description said the item was "possibly the most personal piece of Thatcher memorabilia to appear on the market".
Thatcher, a hugely divisive free-market advocate who led Britain between 1979 and 1990 and formed a close alliance with US president Ronald Reagan, died in 2013.
Her memorabilia changes hands for tens of thousands of pounds. A bottle of champagne signed by the prime minister was recently sold for 45,0000.
Thatcher's famous handbags can fetch up to 65,000.