Certina
ds-2 super ph-1000 pro-dive

Certina DS-2 Super PH 1000 “Scaphandrier”  1971  39 mm steel case (Mostra measurement)  Certina 25-M automatic movement original steel bracelet, vintage professional dive watch in perfect condition.

“When you work below the surface, time isn’t told: it’s managed.”

Far below the swell, there is a place where daylight barely exists. Everything becomes procedure: light carving silhouettes, metal striking metal, breathing setting the tempo, and the quiet discipline of the trades down there—divers, underwater welders, umbilical technicians, bell operators. At depth, you don’t “check” the time; you monitor stops, protect margins, respect durations. Time is not scenery. It is a tool. The DS-2 Super PH 1000 belongs to that culture. Its thick architecture, machine-like presence, and bezel designed to count rather than charm speak of an era when industrial diving became a permanent worksite—and when major underwater research programmes pulled watchmaking into the very real world of protocols.

At Certina, the DS (“Double Security”) concept is not marketing; it is a field-driven obsession with toughness. The brand itself highlights its connection to underwater research programmes, notably Sealab II, where Certina watches were tested on aquanauts at the seabed.  In the same lineage, the DS Super PH500M was evaluated during experiments involving the US Navy and other institutions, and it is known to have been a working watch for aquanaut Ian Koblick on the Tektite missions.  The Super PH 1000 pushes that logic toward extreme diving: a rare, massive, unmistakably 1970s instrument that has become a cult piece among true tool-watch collectors

In 1971, this DS-2 Super PH 1000 expresses itself through architecture first. The steel case is presented here as 39 mm (Mostra measurement), yet its cushion “UFO” design and very thick construction give it the unmistakable presence of a tool—PH1000s are commonly described around 17–18 mm thick depending on configuration and published measurements. 

Its dive bezel has one purpose: immediate, unambiguous immersion timing. On these generations, one often encounters a mineral crystal and tritium lume, period-correct details that anchor the watch firmly in the professional-diver 1970s. Mechanically, the highlight is the movement: the Certina 25-651M (often indicated as “25-M” in common usage), known for strong construction. Published technical bases describe 28 jewels, a 19,800 vph beat rate, and roughly 42 hours of power reserve depending on version and documentation, with a date generally lacking quickset in these families. That is the pure “work” spirit: a robust automatic built to take knocks—not to chase applause.The original steel bracelet matters just as much: with watches like this, balance and comfort depend on how the bracelet integrates the case. Here, the ensemble retains that monolithic, equipment-like character that defines great 1970s dive tools.

Today, a 1971 Super PH 1000 wears like a quiet statement: for someone who loves serious objects designed for real work, and who prefers the credibility of a tool to showmanship. It pairs naturally with denim, knitwear, and technical outerwear, but it also elevates tailored clothing precisely because it never tries to “dress up”—it simply makes sense.And because this is a vintage piece, it should be said plainly: even if the model was historically an extreme diver, a watch over fifty years old is best enjoyed as a collectible and style object. The workshop can inspect and test, but “diving use” can never be assumed from the name on the dial alone—seriousness is also restraint.

This example is stated as in perfect condition, dated 1971, with its original steel bracelet. It comes with a Mostra travel pouch . Buying this Certina from Mostra means choosing a watch selected for what it truly is: a high-identity vintage instrument that deserves workshop scrutiny and transparent presentation. Mostra—renowned for its service and customer experience—has been recognized in the specialist press as the pre-owned specialist. Each piece is carefully checked, explained with clarity, and sold with an exceptional three-year warranty, rare in the pre-owned market, supported by an in-house workshop, deep experience, and verified 5★ Google reviews reflecting consistent customer care.