As you may know, TUDOR in fact call the blue version of the TUDOR Black Bay 58 “Navy Blue”. The story behind this is that, back in 1969, TUDOR introduced a diver’s watch with a blue dial and bezel. Other sports watches in the collection were also soon attired in blue, creating a recognisable aesthetic dubbed “TUDOR Blue”. So that’s the “Blue” part explained, but how about “Navy”?
The aforementioned “Blue” colour was used for the “Blue Snowflake” TUDOR Oyster Prince Submariners from the mid-70s. These models were famously worn by the French Marine Nationale, assisting the nation’s navy far out at sea. The 2020 Black Bay 58 “Navy Blue” title is thus a nod to France’s naval employment of TUDOR. In my eyes, the model’s title and colour scheme alike emphasise not only the importance of the horology house, but also the level of trust TUDOR gains from its customers – not least a prominent and vital client like the French navy.
https://swisswatches-magazine.com/blog/tudor-black-bay-58-black-vs-blue-review/