Dean posted some interesting remarks on watchuseek.com in May 2010 regarding a Ref. 4014 found in a 1950s catalog: "The calibre 203 was indeed a 1940s-era movement which was phased-out in favor of cal. 458 and 1001 in the 50s. Its possible they were using up old stocks."
Also Alex was asking the same question in 2004 on the Purists site, mentioning that it was a movement from the 30s rather than the 40s.
My records show a few watches using this movement were sold at Antiquorum's specialty VC auctions: Quarter Millennium VC and Art of Vacheron Constantin.
I had the chance to get it and I was intrigued by the lack of info on this calibre and I just need more info to put into the file; I asked the concierge to help me via the herritage department with some sort of background. It seems like there are not many out there and that is why I am keeping it, not that I am selling any in the collection but this one is quite an interesting piece of research. Thanks Dan...
from the VC Herritage Department: "Our Heritage Department in Switzerland responded today regarding your inquiry concerning the Caliber 203 movement. Caliber 203 is a 9’’’ (lines) caliber which is 20.60mm in diameter and 3.3mm thick; however the number of jewels can vary according to the year of manufacturing.
Our archives show this caliber was as used between the late 1930’s and early 1940’s, at that time there were no model/reference numbers for timepieces. Later on this caliber was replace by its evolution the caliber 9’’’ 458."
My watch has no Ref# and I am happy I could get it and is the only one I ever saw and touched, it is a beautiful movement and the watch is in pristine condition. Very seldom did I come across a V&C(VC) in bad shape, it seems all have been taken care of and are in perfect working condition no matter when they were made...