ISO 3764:2016

Timekeeping instruments — Movements — Types, dimensions and nomenclature ISO 3764:2016

Scope

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′′′.