The slide rule function can be used to make various calculations, e.g. the flight route, speed or fuel consumption. The slide rule function is used primarily in aviator watches.
The screw connection on the base of the housing optimally protects the inner workings of the watch and simultaneously provides easy access, when changing the battery for example.
Technical amendments and errors excepted for all watch models shown here. The sizes depicted are not the actual sizes. The colours shown may differ slightly from the actual colours.