Measurements & Specifications
Watch specifications provide a common way to describe and compare everything from physical dimensions to movement performance. Understanding these measurements makes it easier to judge how a watch may wear, perform and differ from another model.
This section explains measurements and technical specifications including case diameter, thickness, lug width, lug-to-lug length, water resistance, frequency, accuracy and power reserve. It also covers the units, ratings and testing terminology commonly found in watch specifications and manufacturer information.
Glossary terms
ATM RatingA watch specification field known as ATM Rating, used to describe or compare a measurable or identifying characteristic of a watch.
Bar RatingA watch specification field known as Bar Rating, used to describe or compare a measurable or identifying characteristic of a watch.
Battery LifeA watch specification field known as Battery Life, used to describe or compare a measurable or identifying characteristic of a watch.
Clasp TypeA watch specification field known as Clasp Type, used to describe or compare a measurable or identifying characteristic of a watch.
CurrencyA watch specification field known as Currency, used to describe or compare a measurable or identifying characteristic of a watch.
Dial ColourA watch specification field known as Dial Colour, used to describe or compare a measurable or identifying characteristic of a watch.
Frequency (Hz)A watch specification field known as Frequency (Hz), used to describe or compare a measurable or identifying characteristic of a watch.
Power Reserve HoursA watch specification field known as Power Reserve Hours, used to describe or compare a measurable or identifying characteristic of a watch.
Production YearA watch specification field known as Production Year, used to describe or compare a measurable or identifying characteristic of a watch.
Reference NumberA manufacturer-assigned identifier used to distinguish a particular watch model, version or configuration.
Seconds Per DayA watch specification field known as Seconds Per Day, used to describe or compare a measurable or identifying characteristic of a watch.
Serial NumberA unique or near-unique manufacturer identifier assigned to an individual watch or case.
Vibrations Per Hour (vph)A watch specification field known as Vibrations Per Hour (vph), used to describe or compare a measurable or identifying characteristic of a watch.
Warranty PeriodA watch specification field known as Warranty Period, used to describe or compare a measurable or identifying characteristic of a watch.