TOLEDO Table with Full Calendar - The Vacheron Constantin "Simple Calendar" table refers to the display of dates without regard to changes in the length of the month. Because of this, they must be manually calibrated five times in a year. In addition to the date, many simple calendar tables can indicate the day of the week, the month, and possibly the moon phase. The calendar indicator is one of the most useful functions of the watch in everyday use. They are an early feature of portable timers and even earlier than the minute hand. Based on a differential gear from hour gears, the simple calendar does not consider months or leap years of less than 31 days. For this reason, you have to manually calibrate five times a year, using the push button or the upper link at the end of February, April, June, September and November respectively. Calendar devices can be "Gradient" (with a gradual change of date), half-momentary (one-and-a-half hour expeditions) or instantaneous jumps (midnight punctual shifts). Most simple calendars usually show the date only in a small window. However, some additional information, such as the day of the week, the month, or the moon phase can be displayed by pointers or circular discs visible through the window.
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