Diptych sundials from the 16th century represented one of the most important history achievements in individual time measurement. If used correctly, apart from its accuracy, they made it possible to measure time in many different areas. Members of the Karner, Lesel, Müller (Miller, Miler), Reinmann, Troschel and Tucher families are known as one of the major manufacturers of these diptych sundials, and the city of Nuremberg is the most important center of their production. Such portable sundials were produced from various materials and with various accessories. The parts of 16th century diptych sundials made of ivory and bone (deer skull) were found on archaeological sites Donja Stubica - Stari grad and Konjščina - Stari grad in Krapina-Zagorje County in Croatia. On both finds, characteristics in terms of materials, shapes, motifs, engraved years and function can give us an indication that these are products that came from workshops in the city of Nuremberg. Diptych sundials from the Croatian territory were discovered on private forts, and although it is difficult to discover and prove who the owners of these sundials were, due to the place of discovery, there is a possibility that the owners were noblemen.