Swiss silver deck watch with lever escapement Circa 1956

Extremely rare watch with split seconds chronograph
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An extremely rare deck chronometer 24”CCR with split seconds chronograph, Ulysse Nardin SA in le Locle, Switzerland, circa 1956. The numbered screwed case of this watch was crafted from silver and is engine turned on the inside. The numbered silvered dial features a 1/10^th second’s register, a minutes – and hour track with Arabic 5 minute and hour numerals, a subsidiary seconds dial at 6 o’clock, a 30 minutes counter at 12 o’clock, blued steel Breguet hands and is marked “Chronometre”. The numbered Ulysse Nardin top movement 24”CCR is fitted with an anker chronometer escapement, a split seconds chronograph and a counter.
The dial and movement share matching numbers and the dial and movement are signed.
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Diameter: 65 mm
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Weight: 252 g
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Signed: Ulysse Nardin Locle Suisse
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The item presented here is an extremely rare chronometer with an extract from the archives confirming the limited series of this watch (402 pieces), made in 1956.
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24’’CCR
On a 1956 Ulysse Nardin watch, the marking  24”CCR refers to the specific mechanical movement (caliber) used in high precision Observation Marine Chronometers and deck watches produced during that era. 

The components of this designation break down as follows:

• 24” (24 Ligne):This represents the physical size of the watch movement in “lignes,” a traditional watchmaking unit of measurement. One ligne is approximately 2.256mm, so a 24 ligne movement is roughly 54 mm in diameter.
• CCR (Chronographe Compteur à Rattrapante):In English, this translates to Split Seconds Counter Chronograph. This indicates that the movement has a “split seconds” (rattrapante) function, which allows the user to time two simultaneous events or record intermediate lap times using two separate seconds hands. 

Key Details of the 1956 24”CCR:

• High Precision:These watches were often delivered with an Observatory bulletin from Neuchâtel, certifying their extreme accuracy for professional or scientific use.
• Limited Production:For the 1956 production year, archive extracts indicate that this specific caliber was part of a highly limited run – one such recorded series was limited to only 402 pieces.
• Technical Excellence: These movements were capable of measuring time to 1/10th of a second due to an escapement that beat at 36.000 vibrations per hour (vph)