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C

C.O.S.C.

The Control Officile Suisse de Chronometers, an independent regulatory council that tests and certifies watch movements for chronometer status.

Cotes de Geneve

Surface decoration comprising an even parttern of parallel stripes, applied with a quickly ratating plastic or wooden peg. Also reffered to as Vagues de Geneve.

Crown

The crown, often referred to as the winding crown or winder is used for winding the watch in the case of a non-automatic, for setting the hands to the correct time and often for setting the date in the case of calendar equipped watches. On diving/sports models, the crown may be screw down whereby it screws onto a threaded tube which protrudes from the case of the watch. This often ensures superior water resistance.

Crystal

The crystal is the clear cover over the dial. Can be referred to as the glass. Various materials have been used over the years including acrylic, mineral (glass) and sapphire.