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The value of Sam Francis's Dark Blue Cup (signed) is estimated to be worth between £600 and £900. This lithograph print, created in 1973, has shown consistent value growth, with an average annual growth rate of 7%. This is a rare artwork with an auction history of two total sales. The hammer price over the last 12 months has ranged from £1,993 in July 2020 to £10,176 in October 2021. The average return to the seller is £5,172. The edition size of this artwork is limited to 30.