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Prijspenning van de…
Jan Daniel Posthumus, 1894, award medal, KOG-S-MP-94
Prijspenning van de…
Jan Daniel Posthumus (possibly), 1896, medal, KOG-S-MP-107-10
Jan Daniel Posthumus, 1894, award medal, KOG-S-MP-94
Jan Daniel Posthumus (possibly), 1896, medal, KOG-S-MP-107-10