The perpetual calendar was discovered in 1795 by Abraham-Louis Breguet. He gained patent for Quantieme Perpetual which was originally a pocket watch that has the capability to read correct dates for months with 28, 29, 30 or 31 days every four years without any manual intervention.
In order to achieve such calendar, these mens watches are made of very refine parts within. Most of these moving parts are miniaturized in diameter as well as the thickness.
Until today, the creation of perpetual calendar is still greatly appreciated as an art of achievement involving minuscule mechanical parts. So generally, such high precision standard drives the value of these calendar complications.
Most of these calendars can come in many different forms of execution. Some uses hands to indicate subdials for date, day, and month.
Or it can have windows or even mixture of hands and windows to execute the information. There are some that have or do not have leap-year indications. More sophiscated ones even have digital displays for the year.
Whichever executions that they use, it involves having a pillar-plate (this also known as a main plate that supports the bridges, wheels, and various parts for a movement) to house many of these components fastened on the dial-side. Then the watch dial will be laid on top of the pillar-plate to complete the indication.
Many of the mens watches with perpetual calendar prefer to use automatic movements to allow the date storage to remain accurate. This is because even when the watch is not in use it still records the correct date within.
Recognizing that there are possibilities that the watches are not automatic or slight deviations in accuracy, some of these watches have corrector affixed on them.
A corrector is a pusher on the side of a watch case to allow quick setting of the different indications on the dial, for example date, calendar, as well as perpetual calendar.
Non-automatic watches will need correctors so that the wearer can adjust the various indications after prolong of non-usage.
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