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The value of Robert Indiana's The American Four (signed) is estimated to be worth between £1,050 and £1,600. This screenprint, created in 1970, has shown consistent value growth and an impressive auction history. The hammer price over the past five years has ranged from £1,070 in August 2020 to £2,002 in March 2021. The artwork has an average annual growth rate of 4% and an auction history of 10 total sales since its entry to the market in January 2016. The edition size of this piece is limited to 200.