Reference 233.90.41.21.03.001 presents the Seamaster 300 Master Co-Axial as a thoroughly capable diver's watch. The 41mm titanium case is fitted with a scratch-resistant sapphire crystal, a screw-in crown, and a transparent case back that reveals the automatic chronometer movement within. A uni-directional rotating bezel completes the functional profile, offering the timing precision expected of a serious dive instrument.
The titanium bracelet, finished in a combination of brushed and polished surfaces, secures via a push-button folding clasp. Titanium throughout keeps the overall weight low while maintaining the structural integrity needed to support 300 metres — or 1,000 feet — of water resistance. The blue dial adds a composed, nautical character to a watch that is otherwise defined by its technical credentials.
Powering the watch is an automatic movement that carries COSC chronometer certification, confirming its precision meets the strict standards of the Official Swiss Chronometer Testing Institute. The transparent case back allows a direct view of the movement, making this reference as visually engaging from the rear as it is from the front.
