Rolex was originally founded in England in 1908 and moved its chief operations to Switzerland in 1919, just after World War One. In 1944, just as World War II was ending, Rolex produced their 50,000th Officially Certified Swiss Chronometer watch which was a huge milestone.
It took Rolex close to four decades to produce 50,000 watches, which is profound, because today they probably produce more than 50,000 per month.
Rolex executives decided they wanted to present as a token of their appreciation their 50,000th Officially Certified Chronometer Rolex watch to Swiss Army General Henri Guisan. On May 17, 1948 General Guisan wrote this lovely letter to Rolex founder and Director General of Rolex, Hans Wilsdorf.