Vacheron Constantin SA was founded in 1755 by Jean-Marc Vacheron, and is still based in Geneva, Switzerland. The founder’s son, Abraham Vacheron, became the head of the family business in 1785 before it was passed on to grandson Jacques-Barthélemy Vacheron in 1810.
François Constantin was brought on as an associate in 1819 in order to facilitate brand expansion overseas, with the company being renamed as Vacheron & Constantin. By 1940, a majority portion of the brand was acquired by Georges Ketterer, and renamed as Vacheron Constantin in 1970 by his son Jacques.
The brand has been owned by the Richemont Group since 1996.
1950 Swiss Motorcycle Grand Prix and 1950 Nations Grand Prix
The joint event program of the 1950 Swiss Motorcycle Grand Prix and the 1950 Nations Grand Prix features Vacheron et Constantin branding on its cover. The context of the appearance is not well documented.
Royal Eagle Formula 1 Istanbul 2006
Listings for what appears to be some form of Turkish Grand Prix edition of a Vacheron Constantin Royal Eagle have been found on Chrono24 and Luxepolis. The words “Grand Prix Formula 1 Istanbul 2006” appear on the case back, and with a limited run of 50 pieces. Details surrounding this piece are not well documented.
References
https://www.chrono24.com/vacheronconstantin/royal-eagle-chronograph–id46290205.htm
https://www.luxepolis.com/all-brands-vacheron-constantin/pre-owned-luxury-vintage-watches/vacheron-constantin-grand-prix-formula-1-istanbul-chronograph-18k-gold-complete-set-vcwt1009-html