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The reverse die similar to the 1917.
This variant can unfortunately serve as a basis for making very difficult to expose counterfeit 1917 coins.
Variant described for the first time by J. Chałupski at Cafe Allegro on December 1, 2007.
Referência : Chałupski 1.1.2.a
Coleção : Kingdom of Poland 1917-1918