Vijftigjarig bestaan van het Natuurkundig Genootschap tot Nut en Vergenoegen te Arnhem, gesticht door Wessel Knoops 1874

This commemorative medal, designed by Izaak Alexander de Vries in 1874, celebrates the 50th anniversary of the Arnhem Natural Science Society. The obverse features a bust of the society's founder, Wessel Knoops, along with various scientific instruments, while the reverse displays a laurel wreath with the dates "1824-1874" and "16 MAART," commemorating the society's founding date. The medal's small size, measuring 5.2 cm in diameter, reflects its purpose as a commemorative token rather than a large-scale artwork. This medal represents the Dutch tradition of medallic art, often used to mark important historical events and commemorate significant figures.