ISO 3764:2016

Timekeeping instruments - Movements - Types, dimensions and nomenclature

ISO 3764:2016 specifies the types and fitting dimensions of mechanical and electromechanical watch-movements.

This International Standard is applicable to the five following types of movements:

- Type 1: round;

- Type 2: shaped round;

- Type 3: round with double cutting;

- Type 4: 5 ½′′′;

- Type 5: 6 × 8′′′.

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