The case of the 60th anniversary edition of the 30 Atmos will be familiar to fans of the brand. Squale’s cases tend to have a combination of easily flowing lines and sharp, well-defined elements that give it a tough but elegant look. In profile, the 30 Atmos is sleek, and you can easily imagine this being a solid one-watch decision for vacations, being both ultra waterproof and on the dressier side of sporty. At a hair over 40 millimeters in diameter and just over 12 millimeters thick — and those dimensions coupled with a profile that most certainly isn’t a giant slab — this watch isn’t particularly chunky and should wear easily on wrists of all sizes.

From the top down, the 30 Atmos bears a striking resemblance to famous vintage Blancpain dive watches, some of which utilized Squale cases. With the spare design of the rotating bezel and combination of Arabic numerals and simple rectangular indices, the visual quoting is unmistakable. Squale, in the early days of the brand and through the 1980s, was well known for providing high-quality cases to many of the big Swiss luxury brands, including Blancpain, well before it was “in-house” or nothing. Parts sharing in the ’60s and ’70s was practical and common, and it helped to ensure quality as well, since Squale (and EPSA) were known to produce reliable and extremely well-made cases engineered specifically for diving. This release is somewhat of a throwback to Squale’s roots as a supplier for others, and I admire how they take pride in that in an age where nothing is prized more than a brand’s vertical integration.