A large late 19th Century English centre seconds lever in a silver open face case. Gilt three quarter plate keywind movement with fusee and chain. Harrison's maintaining power. Engraved cock with polished steel regulator, compensation balance with blue steel spiral hairspring. English table roller lever escapement. White enamel dial marked “Centre Seconds Chronograph”, centre seconds, Roman numerals, blue steel seconds hand, gilt hands. Substantial large plain silver open face case with ribbed middle, vacant shield shaped cartouche and oval garter on the back cover. Gold hinges and slide in the band to stop the balance, maker's mark “IJTN” in a rectangle and number corresponding to that on the movement.