What is a module?
The below definitions grant a basic answer to the question of modules.
"An additional mechanism added to a movement, for example, a Perpetual Calendar." (FHH)
"Sub-assembly comprising several components that can perform one or more special functions of a time-measuring instrument .A module can be fixed on a basic calibre to add extra functions.” (Berner)
The dial removed from the pocket watch.
The perpetual calendar module removed from the movement.
Modules have existed for hundreds of years in watchmaking. They grant the pragmatic approach to watchmaking to add a complication to an existing movement without the need to design an entire movement from scratch inclusive of the added desired complication/function.
Dubois Dépraz Retrograde Seconds, GMT & 24 Hour Indicator module. Reference 15115
Deconstruction Dubois Dépraz Full Calendar and Moon Phases Module. Reference 90000
Dubois Dépraz Chronograph with Big Date and Moon Phases Module. Reference 4504
For some, the addition of a module, instead of integrating additional functions into a calibre is seen as a compromise in intrinsic design. However, apart from the financial advantages of adding modules to diverse calibres, modules possess basic technical advantages. These allow brands and watchmakers, to separate the complexities of a calibre into different parts, facilitating production as well as after-sales service.
Deconstruction Parmigiani Hijri Perpetual Calenda.
Deconstruction Parmigiani Hijri Perpetual Calendar module.
Parmigiani Hijri Perpetual Calendar.
The Hijri lunar calendar is based on the cycles of the moon and consists of twelve months of 29 or 30 days depending on the moon phase and is used to pinpoint the days for Islamic holidays.