This compass is a true to original copy of a 19th century lifeboat compass.
The compass itself seems to float in liquid but actually turns on a needle, it gimbals (without any fluid).
The two viewing windows allow a good look from two sides.
On both ends there are paraffin burners for illumination.
Height: 19 cm / 7.4"
Width: 27 cm / 10.6"
Diameter of the viewing windows: 10 cm / 3.9"