Pre-owned/unworn Omega Seamaster Planet Ocean 600M ref 215.30.40.20.03.002 (2026). Omega introduced its “Summer Blue” watches as part of the Seamaster collection’s 75th anniversary celebration, giving several of the brand’s most recognizable dive watches a fresh monochromatic blue aesthetic inspired by the ocean itself. Each model received a unique shade and gradient treatment tied directly to its depth rating, with darker tones symbolizing deeper water resistance. On the Planet Ocean 600M, the effect is especially fitting given the collection’s reputation as one of Omega’s most capable modern dive watch platforms. This reference pairs a 39.5mm stainless steel case and bracelet with a vertically brushed ceramic dial finished in Summer Blue with a gradient effect that subtly darkens toward the outer edges. The matching blue ceramic bezel and light blue diving scale give the watch a highly cohesive look while still maintaining the bold, technical personality collectors expect from the Planet Ocean lineup. Omega added a commemorative Seamaster medallion to the case back featuring Poseidon alongside both vintage and modern Seahorse logos, tying the watch directly to the collection’s anniversary celebration. Shop OMEGA Seamaster Collection