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The value of John Piper’s Warkton, Northamptonshire: Monument By Vangelder, a signed lithograph from 1964, is estimated to be worth between £950 and £1,400. This work has an auction history of two sales since its entry to the market in March 2019. The average annual growth rate of this artwork is 2%. The hammer price for this piece is consistent, providing a reliable average return to the seller of £391. The edition size of this artwork is limited to 70.