Being inspired by Dean's post below about "Fabrique Pour Vacheron Constantin", the Charles Constantin quote from 1916, and some production figures that Alex provided in his Chronometre Royal 1907 article:
Is the CR pocket watch VC's highest volume production watch ever? (Over 10,000 were made from 1907 - 1919)
That averages out to be about 70 CRs per month, every month, for over 12 years. I can't imagine any other VC watch being produced in 5-digit quantities. (I recognize the CR came in different sizes and different calibres, but still the volumes seem huge for VC and still not enough to meet the overall market - hence "This intelligent solution" that Charle Constantin refers to).