Launched in 2025, the Zenith Defy Extreme Diver Topper Edition 95.9602.3620/51.I303 is a special release of just 50 units in collaboration with Topper Jewelers. At its core, this timepiece utilizes the Defy Extreme Diver design, and it is crafted from lightweight titanium. The case has a diameter of 42.5 millimeters and a thickness nearing 15 millimeters. It features a screw-down crown, safeguarded by integrated crown guards, along with a sapphire crystal on the front and an exhibition case back made of sapphire, ensuring a water resistance of up to 600 meters, which is 60 ATM. It meets the stringent ISO 6425 standards, guaranteeing durability against shocks and paramagnetic influences.

The watch presents a dial highlighted by a unique blue wave design exclusive to this edition, which includes a glowing bioluminescent effect achieved through Super-LumiNova, reminiscent of the bioluminescence found in the depths of the sea. Complementing the dial is a blue ceramic bezel insert, rhodium-plated faceted hands, and markers, all treated with Super-LumiNova X1 for enhanced visibility. Time is displayed via central hands for hours, minutes, and seconds. It is driven by the El Primero 3620 SC automatic movement, a high-frequency calibre operating at 36,000 vibrations per hour, specifically crafted without a date feature for this model, offering roughly 60 hours of power reserve. Observers can admire the intricate details of the movement through the sapphire case back, which includes a striking blue oscillating weight. The watch comes with Zenith's interchangeable strap system, allowing for various wearing styles suitable for both land and underwater adventures.