USA 1863 $20 Gold Certificate – $352,500

USA 1863 $50 Bill – $182,125 (£146k)

USA 1863 Spread Eagle $100 Bill – $305,500 (£245k)

USA 1869 Fr.151 $50 Bill – $176,250 (£142k)

USA 1880 Black Back $100 Silver Certificate – $235,000 (£189k)

USA 1880 Fr. 187k $1,000 Bill – $330,000 (£265k)

USA 1880 Fr. 1851 $500 Bill – $411,250 (£330k)

USA 1880 Fr.187J $1,000 Bill – $176,250 (£142k)

USA 1882 $100 Gold Certificate – $117,500 (£94k)

USA 1882 $500 Gold Certificate $1.4 million (£1.12m)

USA 1882 Fr.1192a $50 Gold Certificate – $200,000 (£161k)

USA 1883 $500 Brown Seal Gold Certificate – $193,875 (£156k)

USA 1890 $100 Treasury Note – $129,250 (£104k)

USA 1890 Grand Watermelon $1,000 Treasury Note – $3.29 million (£2.6m)

USA 1891 $50 Seward Treasury Note – $235,000 (£189k)

USA 1891 Red Seal $1,000 Treasury Note – $2.5 million (£2m)

USA 1902 Alaska $5 Bill – $246,750 (£198k)

USA 1907 $1,000 Gold Certificate – $176,250 (£142k)

USA 1928 $50 Gold Certificate – $120,000 (£96k)

USA 1931 Rare $10 Silver Certificate – $500,000 (£402k)