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A number naming a movement.
Also known as: Movement caliber, Calibre number watch
The number engraved on a watch movement identifying its design.
Identifies the design of a watch movement.
Contexts: History, Public information
Names the design rather than the individual watch, so two watches with different brands on the dial can carry the same caliber and be the same machine inside — which is the fact the marking makes discoverable.
Contexts: History, Public information
Visible only with the case open, so it is a mark for a watchmaker rather than for an owner.
Contexts: History, Public information
A number, sometimes with letters, engraved on a bridge or plate of the movement and visible only when the case is opened.