Glashütte Original Senator Perpetual Calendar Watch – Review

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The Glashütte Original Senator Perpetual Calendar (Senator Ewiger Kalender in German) is part of the company’s flagship Senator collection and has several complications including a perpetual calendar and phases of the moon.  It displays the day, month, year, and moon phase.  The day is displayed on two discs in an oversized window which the company calls a Panorama Date.  The perpetual calendar will automatically recognize leap years and the length of months. If worn and/or wound regularly, it will never need to be adjusted.

Indeed, on the Glashütte Original Senator Perpetual Calendar, the day, date, month, year, and leap year indicator will all be displayed correctly until March 1, 2100.  (2100 is an anomaly in the Gregorian calendar as it should technically be a leap year, but there will be no February 29.)

The Glashütte Original Senator Perpetual Calendar has the company’s automatic movement caliber 100-02. It has a diameter of 40 mm, a height of 12.4 mm, and sapphire crystals on top and bottom (making it possible to admire the movement through the caseback). It’s waterproof up to 50 m.  Its strap is made from Louisiana Alligator leather and has a deployant clasp, which makes it easy to take on and off without unduly causing wear and tear to the leather strap.

On the dial, you’ll see the month at the 2 o’clock position, the big date at 4 o’clock, the day of the week at 10 o’clock, and the small round window that turns red to indicate a leap year at 12.  The moon phase indicator is at the 8 o’clock position.  As the full moon approaches, so does the moon on the dial.

The case itself has a very clean look and a single crown.  Corrector buttons are placed around the case and are used to adjust the functions. The watch comes with a stylus to aid in making adjustments and prevent damage to the buttons.

Owning a watch with such complications is, well, complicated.  The instruction manual warns the user not to make changes to the Perpetual Calendar between 7 p.m. and 1 a.m. (and on February 29th, not between 5 p.m. and 1 a.m. on the next day, March 1).  In addition, I was told not to change the time after 5 p.m. as well.

Through the sapphire caseback, you can see the impressive detail of the Calibre 100-02 movement.  It is endowed with 59 jewels, beats at 28,800 vph (vibrations per hour), and a 24K bi-directional oscillating rotor generating 55 hours of power in reserve.  The movement has signature Glashütte touches including the three-quarter plate with Glashütte ribbing, the skeletonized rotor with 21-ct gold oscillation weight, twin spring barrels, and swan-neck fine adjustment.

I have been wearing the watch fairly regularly and, since it has a 55 hour power reserve, as long as I wear it at least briefly within a 55 hour period, it keeps on running.  For longer periods of time, to keep the Senator Perpetual Calendar wound, I use an Orbita Siena watch winder.  The Siena is, as far as I am concerned, the perfect watch winder, thanks to its elegant wooden case with a sloped front that affords an excellent view of the Glashütte watch being wound.

[Photos:  Ivana Bozikovic (watch), Glashütte Original (town)]

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