Omega
Semaster 300 Blue Coaxial - Chronometer Certified

Omega Seamaster Diver 300M — Ref. 212.30.41.20.03.001 — 41 mm — Co-Axial Caliber 2500 — Steel & blue bezel — Pre-owned 2018 — OMEGA service box

Beneath the surface, the Mediterranean has its shades of blue; the Seamaster knows the full range of their hours.

The boat cuts the engine off Port-Cros, the water turns a dense blue and the slap of the waves all but disappears. Mask on the forehead, regulator in, you follow the chain down to the overhang. Light scales across the rocks, schools of sars (saddled seabream) sweep past, a sea fan sways in a corridor of current. Tomorrow it will be the calanque of En-Vau, the day after Scandola in Corsica, and you already know when to drop to meet the barracuda. On the wrist, the Seamaster sets the tempo: bezel aligned before the splash, crisp legibility as the light fades, the feel of a tool made for those salty hours when land is forgotten. Back on deck, you rinse, stow the straps, tidy the lines: the sea has its rituals, and so does the watch.

The Seamaster Diver 300M was launched in 1993, establishing a modern tool-watch architecture: 300 m water-resistance, a unidirectional bezel, a helium-escape valve at 10 o’clock and exemplary legibility. Reference 212.30.41.20.03.001 belongs to the 41 mm generation powered by the Co-Axial caliber 2500 with a blue ceramic bezel, produced in the 2010s and frequently documented between 2015 and 2019; our 2018 example sits at the end of this series, just before the arrival in 2018 of the new 42 mm Diver 300M (caliber 8800, with the return of the “wave” dial).

The 41 mm steel case offers balanced presence and real ease in the water. The blue ceramic bezel, engraved with a 60-minute scale, turns with precision; the screw-down crown and helium-escape valve secure the assembly; the sapphire crystal protects a glossy blue lacquered dial with applied indexes and luminous hands, with a date at 3 o’clock for daily use. Inside, the OMEGA 2500 caliber (Co-Axial escapement) delivers a steady rate and about 48 hours of power reserve; the solid caseback reinforces its tool character. Water-resistant to 300 m, it makes leisure diving carefree—from surface swims to early-morning descents. The steel bracelet with brushed/polished links and a folding clasp is solidly comfortable, ready for the season and beyond. (Specifications confirmed for 212.30.41.20.03.001: 41 mm, cal. 2500, 300 m, blue ceramic, lacquered dial, HEV.)

Designed for the sea, this Diver 300M moves from shorty wetsuit to polo shirt without changing register. In the port of Cassis it catches a cobalt glint; in town, it slides under a light jacket. The blue ceramic bezel echoes the Mediterranean’s blues, the 41 mm size suits most wrists, and the look remains contemporary without ostentation. Selected and inspected by our in-house watchmaking atelier, this Seamaster comes with Mostra’s 3-year warranty, an authenticity certificate, care advice and after-sales support. Our expertise in contemporary and vintage dive watches secures your choice—at the right price and with proper follow-up.

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