London: A lipstick print on a napkin left by Britain's "Iron Lady" prime minister Margaret Thatcher during a visit to the US 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 USD 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.
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 pounds.
Thatcher's famous handbags can fetch up to 65,000 pounds.