Rolex at Baselworld 2017 was a little anti-climactic for some, at least relative to 2016. There wasn't an A-list mega introduction like there was last year with the Daytona. Instead there was an update to the least well-known and certainly least understood tool watch made by Rolex.

The new Sea-Dweller came as a surprise in some ways but not others. Of course, 2017 marks the 50th anniversary of the introduction of the first Sea-Dweller 1665. But also it's important to note that we got a whole new Sea-Dweller in 2014 – that's a heck of a short run for a Rolex reference when you remember that the first Sea-Dweller was made from 1967 all the way up until the 1980s. The 5513 ran from the early '60s through the late '80s.

This is Rolex, dammit, and things shouldn't change too quickly – but they did. Though the 116600 Sea-Dweller 4000 was a great watch, with its cyclops-less crystal, 40mm case, and ceramic bezel, Rolex replaced it just three years after it was introduced.

The new 126600 is very much a Sea-Dweller though, don't be confused about that. It has a helium escape valve just as it should and it's water resistant to 1,300 feet deeper than the Burj Khalifa, the world's tallest building, is high. The thing is incredible, undoubtedly. However we gained three millimeters in diameter from 2014 to 2017, and that means it's no longer the same case size as the original. Further we have a cyclops window on the crystal, which if you're a Sea-Dweller guy, could be seen as something of a tragedy. Let's go through the reference 126600 in detail, now that I've had a chance to spend a week wearing it.