Davosa has set its own limited Argonautic diver clock in black carbon to prove it is 140 years old.
A Swiss manufacturer manufactures a watch in two ways; both black and white carbon containers and bracelets, but one has green markings and the other orange.
There will be 140 made by each.
The 43mm clock is waterproof to 300 meters and is powered by a modified Sellita SW-200 system.
Dealers in Davosa have watches for sale for € 1198.