A Swiss chronometer watch has undergone a series of precision tests in this official institute. A crown is also used for setting the hands to the right time and for correcting the calendar indications. The crown actually screws into the case, dramatically increasing the water resistance of the watch. Date Ordinal number referring to a day of the Date. Also called a calendar-watch or calendar.
Dials vary very much in shape, decoration, material, etc.
The indications are given by means of numerals, divisions or symbols of various types. Direct-drive Refers to a seconds hand that moves forwards in little jerks. Trotteuse, French seconds hand direct drive. Such dimechanical is obtained by mechanical or electronic means. Etablisseur French term for a watch factory which is engaged only in assembling watches, without itself producing the components, which it buys from specialist suppliers.