The 40 ATM is a limited edition numbered from 1 to 100. Let us know your preferred number via the contact form. Here is the new version of our 1955 watch, this time featuring a Tropic strap—a classic style revived from the 1960s, just like Kelton. The Tropic strap has always been a trusted companion for divers and other water sports enthusiasts, thanks to two key qualities: flexibility and durability. Our Tropic strap, which now comes standard on the 1955 models, is made—just as it was back then—from FKM, a process that uses high temperatures and sulfur to alter the rubber’s structure and make it more durable without compromising its flexibility. It also gives your strap a glossy sheen, quite different from the cheap silicone reproductions you’ll find just about everywhere. You may have spotted our 40 ATM on Stanislas’s wrist