This is fascinating device used to tell the time and must have gadget for an antique traveler.
This instrument is intended to be used in historically accurate scenes or any other game environment.
this one is used in historical game project by Vestigia.

Prefab:
SM_sundail – Polygon: 958

Technical details

UV mapping and geometry: Polygonal Quads.
Texture set dimensions and number: 2048x2048; 1 set (5 channels).
Types of materials and texture maps: PBR metallic – roughness.

Source:
Museum of the History of Science, Oxford (inv. 51358)