It's estimated that both posters could be sold for up to $6,000 (£4,400) each at auction On the right is a second poster of the actress by Mucha, dating back to circa 1914. Pictured on the left is an Art Nouveau poster by Alphonse Mucha for the French stage actress Sarah Bernhardt, advertising her 'World's Tour' in the 1910s. Meanwhile, health authorities w...