48mm. 300 meters. Built like underwater equipment because that is exactly what it is.
The Citizen Promaster Dive “Ecozilla” BJ8050-08E is one of those watches that makes no attempt to disappear on your wrist. The oversized stainless steel case, massive bezel and reinforced polyurethane strap were designed around serious dive use, while Eco-Drive keeps ownership simple by powering the watch from light.
Why this watch stands out
The nickname tells you a lot. “Ecozilla” has become shorthand for this model’s huge, industrial presence, but the size is not just theater. Citizen built it as a professional diver with 300 meters of water resistance, a screw-down crown, a one-way elapsed-time bezel, a thick anti-reflective mineral crystal and a strap extender for wearing it over a wetsuit.
Inside is Citizen’s B873 Eco-Drive movement. It is a straightforward three-hand-and-date setup powered by light, which feels exactly right in a watch whose job is to be dependable rather than delicate.
What you’re getting
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48mm stainless steel case: Big, unapologetic and designed for maximum wrist presence.
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300m / 30 bar water resistance: Built for scuba diving, not just dive-watch styling.
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One-way elapsed-time bezel: Lets you track dive or elapsed time without accidentally extending the reading.
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B873 Eco-Drive movement: Powered by light, so there is no regular battery-change routine.
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Anti-reflective mineral crystal: Thick, impact-resistant protection designed for a hard-use watch.
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Luminous hands and markers: Built for fast legibility in low light.
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Reinforced polyurethane strap: Includes an extender for wearing the watch over a wetsuit.
Our take
This is not a subtle diver pretending to be a dress watch after 5 p.m. The Ecozilla is appealing because it commits completely to what it is: oversized, functional and a little outrageous. It has the personality of specialized gear, even if most of its life is spent nowhere near 300 meters of water.
Best for
Someone who wants a serious dive watch with unmistakable character, especially if you like large watches and would rather have purpose-built hardware than something polished into anonymity.
Know before you buy
48mm is very large. This is the most important thing to understand before ordering. The watch also weighs about 180g and uses a 29mm lug width, so it is not especially easy to dress down with ordinary aftermarket straps. The crystal is mineral rather than sapphire, which prioritizes impact resistance over maximum scratch resistance.
