In A Nutshell Antiques and Interiors has dated this piece to the 1940s.
It allowed them to determine their precise position and true heading by measuring the angles between celestial bodies like the sun, moon, and stars, and the horizon.

The compass itself has its original black painted finish and a plaque which has all its parts and serial numbers. It also comes with an interesting article dated 1955 about the use of these compasses after the war.

It is in good condition for its age. It has picked up some knocks, surface scratches and signs of wear over the years but it displays nicely. I have not tested the compass for accuracy and it is sold as seen as a decorative / collectors piece.
The best description comes from the photos so please look at them all carefully and if you have any questions just ask.
Tracked UK Delivery £10
In A Nutshell Antiques and Interiors has dated this piece to the 1940s.
Selling good quality victorian, georgian and earlier furniture, accessories & decorative items. Ashburton, devon. LAPADA member
You can view the stock and full dealer information on the In A Nutshell Antiques and Interiors Profile Page
In A Nutshell Antiques and Interiors is a registered member of LAPADA CINOA