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Glossary
An analogue-display chronograph watch (with pointer-type
display of the hours, minutes and seconds) is equipped with a
mechanism capable of measuring a given time.
The time counted off is generally shown by three other hands
(chronograph hours, minutes and seconds). Calibres PDR 4023
and PDR 4024 do not have an hours chronograph.
The Flyback function (Calibre PDR 4024) consists of enabling the
chronograph to be stopped, zero-reset and instantly restarted in
one single move (instead of three on a traditional chronograph).
This function was initially intended for aircraft pilots.
Functions
In addition to displaying the hours, minutes and seconds, Cali-
bres PDR 4023 and PDR 2024 comprise the following functions :
• Chronograph (with 60-minute counter)
• Flyback function (exclusively on Calibre PDR 4024)
• Large date
Movement technical specifications
• Dubois Dépraz Calibre 4563 and 44563 (Flyback)
• Diameter / Thickness : 30.00 mm / 7.50 mm
• Frequency : 4 Hz (28,800 vibrations/hour)
• Jewelling : 47 jewels
• Power reserve : 42 hours
• Brass oscillating weight with heavy-metal segment on ceramic
ball bearings
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