Heritage Auctions Europe
Auction 74 16-21 May 2022
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Netherlands - 20 Gulden 8.11.1955 Boerhaave Error (Mev. 60-1 /AV 43.1 / Pick 86) - # 6 AE 020444 - wrong ratio in ink contents: too much red/purple ink front and back - VF/XF