A WW1 GERMAN SUBMARINE CLOCK SIGNE F.N. TIETZ, KIEL the brass circular case with locking bezel enclosing a 6" silvered engraved dial with Roman numerals and sunken subsidiary seconds dial fronting an eight-day spring driven movement mounted on an oak shield with a silver plaque engraved 'Engine Room Clock From German submarine M.124 When Surrendering to British Submarine L.15 23/11/18