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Almost all watches use calendar displays called "Full
Calendars."
With conventional watches, on months with less than 31 days, a wristwatch
has to be wound by hand.
However, the perpetual calendar is equipped with a super-complicated
function that not only enables users to tell the exact date, but
also takes leap years into account.
This was another invention of Breguet's, and only a limited number
are produced each year, as symbolic of prestigious super-high grade
watches.
It is both an essential and distinct characteristic of the perpetual
calendar that it needs to be used continuously in order to display
the correct date.
However, it is impractical to wear such a luxury item every day,
and what is bound to happen is that one the few occasions you decide
to wear the watch, you find that it is out of date. It is hardly
worth the trouble it takes to adjust the date, considering you may
only wear the watch once every month.
Thus the outstanding function of perpetual calendar becomes practically
pointless.
On the other hand, with the Shellman Grand Complication, which takes
ultimate advantage of quartz movement, watch lovers do not have to
worry about adjusting the perpetual calendar as long as the battery
is alive. |
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