WWI Koehn (Geneva) vernier marching/sighting compass. Serial 20904 Date 1915
WWI Koehn (Geneva) vernier marching/sighting compass. Serial 20904 Date 1915. A good WWI Ed. Koehn (Geneva) Vernier pattern VII sighting / marching compass. Made by renowned Swiss watchmaking firm Edouard Koehn of Geneva.