The Doxa Nobody Photographs
In 1967, Doxa did two things nobody else had: it put a high-visibility orange dial on a dive watch, and it patented a bezel that calculates a no-decompression ascent. All of that history gets pinned to one model — the curvy orange SUB 300 — and the watch on my bench isn't it.
This is the SUB 600T. Sharkhunter dial, which is just Doxa's word for black. Black ceramic bezel. The 600 is the depth rating in metres, and that's where the name comes from.

The 300 is the one everyone shoots. C-case, 1967, orange dial — the orange Doxa Dirk Pitt wears all through the Cussler novels. Good watch. Also the only Doxa most people can name, which is exactly the problem.
The 600T is the other one. Late-70s design, the watch that defined Doxa through the 80s, and it looks nothing like the 300. No sloping cushion case, no soft edges. Flat sides, sharp angular lugs, broad polished chamfers cutting across the top — closer to brutalist than to anything you'd call vintage-pretty. The C-case crowd finds it cold. I think it's the most honest case Doxa has made, because it isn't leaning on the nostalgia to do the work the steel should be doing.
There's a bigger reason to care, and it's about everything the 600T isn't.
Walk the dive-watch aisle and it's Submariner all the way down. The Submariner shape, the Submariner bezel, the Submariner handset, rendered in steel at every price from forty quid to forty grand. Most of it is cosplay. Doxa is the rare brand with real dive history that never ran that playbook; it built its own language instead. Orange dials, odd cases, and a bezel that does something a Submariner bezel can't. You buy a Doxa to not be wearing the watch everyone else settled for, and the 600T is the version of that you can still buy new.
Most dive bezels count up to sixty and stop. You set zero, you watch the minutes, that's the entire job. Doxa's does something else. It's a no-decompression bezel: the saw-tooth scale reads dive time in minutes against depth in feet, so a diver can read straight off it how long they can stay at a given depth and still surface without a decompression stop. That isn't decoration. It was a working tool built when the alternative was a printed table strapped to your forearm, and Doxa patented it. Sixty years on, every brand selling you a "tool watch" is selling you a count-up bezel and bugger-all else. This is the one that did the maths.

The rest of the watch is built like it means to get wet. Forty millimetres of 316L steel, sapphire on top, 600 metres of water resistance — six times what anyone reading this will ever ask of it, which is the entire point of a margin. The crown's at four o'clock, not three. That's not a quirk; it sits the crown clear of the back of your hand when you flex your wrist, and once you've worn one there you start noticing the watches that don't. Lug-to-lug is 47.6mm and it's 14mm thick, so this is the smallest case in the SUB family that still wears like a proper diver rather than a desk toy. Underneath is a Sellita SW200-1, automatic, 38-hour reserve. No in-house calibre theatre — a workhorse any watchmaker on earth can service, piss-easy, which on a watch you actually dive beats a fragile movement and a six-month service queue, no contest.

So why this one, and why from me.
The people chasing a Doxa want the orange 300; the people who'd love a 600T mostly don't know it's there. You get the actual Doxa invention — the patent bezel — in the smallest, most wearable case in the SUB line, current-production so nothing's a project, and it lists for less than the orange one does new. Overlooked is just underpriced with a longer name.