Letter from the Publisher

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1. vacheron Constantin,
Patrimony Traditionnelle Skeleton Perpetual Calendar
Genevan watch manufacturer Vacheron Constantin provides
an ethereally light version of the perpetual calendar in its
patrimony Traditionnelle Skeleton perpetual Calendar, with its
entirely openworked and engraved movement.
2. Parmigiani Fleurier, Tonda 42 Retrograde Perpetual Calendar
On the Tonda 42 retrograde perpetual Calendar by parmigiani
Fleurier, the abbreviations of the day and month appear on
two discs featuring original shapes and visible through the
transparent dial.
3. Jaeger-leCoultre, Master Eight Days Perpetual SQ
The Master eight days perpetual from Jaeger-leCoultre,
endowed with an eight-day power reserve, is shown here in a
dazzling skeletonized version featuring daringly curved bridges
echoing the lines of longitude and latitude.
4. Cartier, Tortue Perpetual Calendar
equipped with an in-house movement, the Tortue perpetual
Calendar by Cartier combines various types of display—including
a central pointer-type date indication and a retrograde
day running from 8 to 4 o’clock—appearing on an open-
worked dial.
5. daniel roth, Instantaneous Perpetual Calendar
The Instantaneous perpetual Calendar by daniel roth is
distinguished by its system ensuring the instant jump of all
calendar indications at midnight: its self-winding movement
is partially visible through the openworked dial.
6. vacheron Constantin, Malte Retrograde Perpetual
Calendar Openface
Vacheron Constantin has equipped its Malte retrograde
perpetual Calendar Openface watch in platinum with a double
sapphire crystal. Transparent subdials with white rotating
“pallets” serve to indicate the day, month and leap-year cycle
painted in black on one of the sapphire crystals.
7. Patek Philippe, Ref. 5104 Grande Complication
On the ref. 5104 Grande Complication model by patek
philippe, the days, months and the leap-year cycle number are
printed directly on the sapphire crystal dial and dark “pallets”
highlight the appropriate white transfer by contrast.
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Calendars 79 •