BS ISO 3764:2016

This standard BS ISO 3764:2016 Timekeeping instruments. Movements. Types, dimensions and nomenclature is classified in these ICS categories:

• 39.040.10 Watches

This International Standard 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 ¾ × 8′′′.