A set of components that are designed to go together is called an assortiment in French

The French word calibre is commonly used to refer to a specific type of watch movement

Compax was a model name used by Universal Genève to refer to a chronograph watch with minute and hour counters and small seconds at 3, 6, and 9

An ebauche (“blank”) is a basic, unfinished watch movement kit

Ligne is an old French unit of distance traditionally used to measure watch movements