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IWC Da Vinci 3750-28
the World's first automatic chronograph to feature a perpetual calendar,
year display and perpetual moon phase display.
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IWC Da Vinci 3750-28
500 year Perpetual Calendar with Perpetual Moon phase and Chronograph
Designed by Kurt Klaus - IWC Master Watchmaker
   
  Introduced: 1985 in Gold & 1998 in Stainless Steel
            3750 model line is now replaced with 3758-03 & 3758-11
   
- First perpetual Calendar ever displaying years via aperture
- First perpetual Calendar ever with all adjustments via crown only (no pushers on case)
- First perpetual Calendar ever with Perpetual moon phase having accuracy of only 1 day deviation in 122 years !
              These features are now also used by other high-end manufacturers
   
- Case: Two-body, polished, stepped bezel,  hooded mobile lugs
- Movement: Mechanical chronograph to 1/8th second
- Self-winding
- Perpetual calendar
- Four-digit year display
- Perpetual moon phase display
- Small seconds with stop function
- Screw-in crown
- Crown-activated rapid calendar advance
- Water-resistant to 30 m
   
   
- Dial: Flat black color with applied steel bâton indexes & luminous dots, auxiliary dials for the seconds, the 12 hour and 30 minute registers, the days of the month, of the week and the months, apertures for the four-digit year and the moon phases
- Glass: acrylic, convex, anti-reflective coating
- Crown:  screw-in
- Water-resistant:  3 bar (30 m)
- Case diameter:  39 mm
- Case height:  14.3 mm
- Weight: Da Vinci in stainless steel with crocodile strap:  115 g

Except for the regular maintenance, the perpetual calendar does not need any adjustment until March 1st 2100, since the leap year will be skipped that year. The second and final adjustment will be needed January 1st 2200, when new century slide (pictured above) will need to be installed.
This watch encompasses one of the most extreme reduction gear ratios in the history of watchmaking: 1 : 6,315,840,000.
This means that in the course of 100 years, the balance completes no fewer than 252,450,000,000 oscillations before moving the century slide just 1.2mm upwards !!

Interview with Kurt Klaus - the legendary IWC Master Watchmaker who talks about developing this most unique caliber of it's time.

MORE DETAILS ABOUT  IWC PERPETUAL CALENDAR MECHANISM
 

Caliber 79261

with "fausses côtes" decoration




movement diameter : 30.00 mm or 13¼ Paris Lignes
movement height :
8.80 mm
power reserve  :
44 hours
number of  jewels :
39
impulse angle :
52 degrees
oscillating frequency :
4.00 Hertz
halfbeats per hour :
28,800

Straight line lever escapement, monometallic balance, shock-absorber, self-compensating flat balance-spring.

SS 3750-28 U.S. MSRP: (2003)  $12,200
SS 3758-03 U.S. MSRP: (2006)  $14,400
RG 3758-11 U.S. MSRP: (2006)  $24,300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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