P3.江诗丹顿计时碗表历史回顾之一 1917 － 1970 英文版，逐步翻译中。。。。。。。

1939 ref 4111: two push piece cushion chronograph with cal RA 13’ made in only 3 pieces in yellow gold. 
1940 ref 4082: mobile lugs, using cal 295 and a 32.6mm yellow gold case made in 9 pieces. 
 
1940 ref 4083: mobile scroll lugs, using cal 295 and a 33mm case made in 12 rose gold pieces and 6 in yellow gold. 
  1940 ref 4177: The forerunner for the famous ref 4178, the lugs may look similar but are more tear drop shaped. This model housing cal 434 was made in 28 pieces in yellow gold and 24 in rose gold and had a 34.5mm case. 


1940 ref 4178: THE Vacheron Constantin chronograph, the one that aficionados think of when they think of an iconic VC model. This reference was made until 1964. 

Made in the following: 

Cal 434: 231 pieces in yellow gold and 280 pieces in rose gold 
Cal 492: 114 pieces in yellow gold and 108 pieces in rose gold 

The number of pieces in steel and steel/gold is not certain the archives state 191 pieces but with a 20% error margin. 

1943 ref 4305: Vacheron Constantin’s first water resistant chronograph with a very military look. Made in a unique piece in a steel 35mm case. 


1945 ref 4367: based on ref 4178, Vacheron Constantin made two pieces in rose gold on rose gold mesh bracelet. This ref uses cal 434 and has a 36mm diameter. The dial has a very interesting red tachymeter counter. 

1950 ref 4639: A unique model with a 35mm yellow gold case and an amazing yellow gold bracelet. Houses cal 434.

1954 ref 6026: This is a rare bird with a gorgeous case which certainly inspired the ref 49002 of the 90s. Housing cal 492 in a 36mm case it was made for only one year in 19 pieces in yellow gold and 6 pieces in rose gold. 
 
1956 ref 6087: One of my all time favourite chronographs, with stunning cow horn lugs, round pushers and a water resistant case. This ref was made until the mid 60s but two platinum pieces with the same movement (cal 492) but different cases were made in the 90s. Ref 6087 was made in 28 yellow gold pieces and 6 rose gold pieces. The case having a 35mm diameter. It was also Vacheron Constantin’s last chronograph model until 1989! 
  1915-1946 Chronograph Calibers 
Cal 15’ used starting 1915, base ebauche from Reymond Frères SA in Les Bioux 

Cal 13’ used starting 1916, base ebauche from Reymond Frères SA in Les Bioux 

Cal 13’ used starting 1927, base ebauche from Reymond Frères SA in Les Bioux 
 
Cal 295 used starting 1937, with either a 30 minute or 45 minute counter, base ebauche from Martel Watch Co in Les Ponts de Martel 

Cal 434 used starting 1940, base ebauche Valjoux 22 
492 Cal 492 used starting 1943, base ebauche Valjoux 23 

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