The cover opens up by pushing a button on the crown. The hinges open and close well.
Nickel-finished detent chronometer escapement, bi-metallic compensation balance, and a blued steel helical shape hairspring, swan-neck precision adjust, 3 screwed gold chatons/fully jewelled. The detent escapement or chronometer escapement is one of the most accurate and was often used in marine chronometers. Pierre Le Roy invented the first detached detent escapement, while the pivoted detent escapement was developed in France by L.The detent itself is a razor thin blade of metal that blocks the escape wheel, which sits against it under tension from the upstream gears of the going train. Therefore the sound of the watch is very special, different than other lever excapement watches. Working strong, keeping excellent time, with very good power reserve, but not serviced. After winding you have to shake it a little bit and then it starts immediately. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Watches\Pocket Watches". The seller is "pipacs1010" and is located in this country: AT. This item can be shipped worldwide.