The reveal of Blancpain’s Fifty Fathoms Tech BOC IV at Rose – The Watch Bar in Mumbai felt more like a quiet, assured statement than a spectacle. Nestled in Ballard Estate, the flagship House of Rose store combines old-world charm with horological reverence—an apt setting for a timepiece that carries nearly seven decades of diving watch legacy. If you’ve been to the Watch Bar before, you know it’s more than a boutique. It’s a lounge for horology nerds, a safe space for watch talk over coffee or something stronger.
Enter the Tech BOC IV: the latest evolution of Blancpain’s Fifty Fathoms line, limited to just 100 pieces. While last year’s Tech Gombessa leaned into bold proportions with a 47 mm case and an unprecedented 3-hour bezel, the BOC IV trims the fat slightly, clocking in at a more wearable 45 mm. It’s still very much a tool watch at heart—titanium Grade 23 case, helium escape valve, and a black ceramic insert bezel that’s sharply angled for ease of use, even with gloves.
The dial is where things get quietly intense. A deep matte black, designed to absorb up to 97% of light, makes the luminescent markers pop like bioluminescence in deep waters. It’s paired with an integrated black rubber strap that slots into the central lugs from inside the case, giving it a clean and ergonomic fit. Under the hood, you’ve got the automatic calibre 1315A with a five-day power reserve and anti-magnetic silicon balance spring. Flip it over and you’re greeted by a sapphire caseback revealing an 18k gold rotor bearing the blue Blancpain Ocean Commitment logo. But the real story here isn’t just the specs. It’s where the money goes. Each sale contributes €1,000 to fund the new Blancpain x Sulubaaï Marine Research Center in the Philippines, a project rooted in long-term marine conservation. And each watch is accompanied by a numbered Laurent Ballesta photograph of a horseshoe crab—an ancient, endangered creature now protected in the Sea Academy’s marine reserves.
As Blancpain’s team put it during the reveal, the BOC IV isn’t just a collector’s piece—it’s a membership token to the Ocean Commitment Circle. “It’s a reminder that every tick can mean something more than time—it can mean progress,” one representative noted. A limited edition, yes. But in spirit? Limitless.
