⌚⌚ HOTOmega Seamaster 300 "Summer Blue"
Updated Seamaster 300 with sandwich dial and bronze gold accents.
Our take on the Omega Seamaster 300 "Summer Blue"
The Seamaster 300 is Omega's heritage diver, distinct from the more common Diver 300M. The sandwich dial construction — a luminous layer beneath a cut-out top plate — gives the indices real depth, and the bronze gold accents are Omega's own alloy that patinas far more slowly than standard bronze.
What to know before buying
- ▸Sandwich dial with Super-LumiNova beneath a cut-out plate.
- ▸Master Chronometer certified, 15,000 gauss magnetic resistance.
- ▸300m water resistance with a naiad-lock caseback that stays aligned.
- ▸41mm case that wears smaller than its diameter suggests.
Where and how to buy
Widely available at Omega boutiques and dealers. Grey market pricing for Seamasters typically sits 15-20% below retail, which is worth considering if you can accept a dealer warranty.
Prices and availability change constantly. See our authentication checklist before any pre-owned purchase, and our servicing cost guide to budget for ownership.
Omega Seamaster 300 "Summer Blue" — frequently asked questions
Seamaster 300 or Diver 300M?
The 300 is the vintage-inspired, dressier option. The Diver 300M is the modern tool watch with a helium escape valve.
What does Master Chronometer mean?
It is a METAS certification covering accuracy, magnetic resistance and water resistance on the fully cased watch, not just the movement.