Gruen Duo-Dial

GRUEN Duo-Dial rectangular wristwatch 14k yellow gold filled, Switzerland/USA around 1936, rectangulär, measures approx. 43 x 21 mm, snap on curved case back, silver coloured dial restored, blued steel hands, legendary lever movement, calibre 877S, with bimetallic compensation-balance, blued Breguet- hairspring, escapement lateral, 15 jewels, overhaul recommended at buyer's expense, condition 2-3, property of a collector