Vintage, sterling silver, Rolex/Dennison British officers World War I trench wristwatch case. Sterling silver 35.4 mm case by Dennison watch case Co, a very 'Oyster' type profile, hallmarked Birmingham 1914. Case has a screw down case back with fluted edge. Black dial with luminous Arabic markers and sub dial at 6 o'clock. Case # 228442. Movement is by Rolex - a 15 jewel manual wind. No box or paperwork. May need to be serviced to improve accuracy.