Breithaupt Kassel compass

The Breithaupt Kassel compass is a maritime compass crafted from metal and glass in Germany. This antique piece represents the precision and craftsmanship of traditional navigation tools, offering a glimpse into the history and artistry of maritime exploration. Made with quality materials and attention to detail, the Breithaupt Kassel compass is a valuable collector's item or functional navigation tool for maritime enthusiasts. (The above was from AI.) what I know is that my Dad was a surveyor for year and this was in his collection. Not sure what the dial on top does but the inside is surely a compass. Seems to be in excellent condition.