It takes the form of a pocket watch opening with a push button under the bail.
The Wittnauer company was founded in New York in 1885 by a Swiss immigrant, it initially manufactured watches but also instruments intended for aviation during the First World War. During the Second World War, it launched the production of compasses for soldiers and aviators.
The cover is engraved "US".
4.5 cm in diameter
Good condition, scratches from use.
Hand delivery in Paris or insured Colissimo shipping.
France: €15
Europe: €20
World: €35