Omega Seamaster Diver 300m Seamaster Diver 300M Master Co-Axial 42 Stainless Steel / Summer Blue / Bracelet

Reference 210.30.42.20.03.003

About this watch

The Omega Seamaster Diver 300M Master Co-Axial 42 is a masterpiece of engineering and design, blending elegance with robust functionality. Its stunning summer blue dial features a gradient finish, adding depth and character to the watch face. The case is crafted from stainless steel and ceramic, built to withstand underwater adventures. A rotating bezel allows for accurate dive time tracking, and a water resistance of up to 300 meters ensures it can endure ocean depths. At its heart lies the Omega caliber 8800 movement, a marvel of engineering with Co-Axial escapement, reducing friction and enhancing longevity and accuracy. Rigorously tested according to Master Chronometer certification, this watch is resistant to magnetic fields reaching 15,000 gauss and has a power reserve of 55 hours. The Seamaster Diver 300M comes with a stainless steel bracelet that complements the watch's aesthetics while providing a comfortable fit. Its versatility makes it suitable for various environments, from diving to formal events.
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MSRP: $6,300
Market Price: $4,986

Key Features

  • Stainless Steel and Ceramic Case
  • Summer Blue Gradient Dial
  • Omega Caliber 8800 Movement
  • 300m Water Resistance
  • Co-Axial Escapement
  • Master Chronometer Certified
  • 55 Hour Power Reserve

Specifications

Brand
Omega
Family
Seamaster Diver 300m
Model
Seamaster Diver 300M Master Co-Axial 42 Stainless Steel / Summer Blue / Bracelet
Reference
210.30.42.20.03.003
Movement
8800
Movement Features
  • Hours, Minutes, Seconds
  • Date
  • Chronometer, Co-Axial Escapement
Case
42mm
Dial Color
Blue
Crystal
Sapphire
Water Resistance
300

Current Listings

[WTS] 2024 Omega SMP300m Summer Blue $4999

2024 Omega SMP300m Summer Blue $4999

A beautiful 2024 Omega SMP300m Summer Blue in full kit form.

  • Condition: Incredible condition, still under warranty
  • Depth Rating: 300m
Posted at
Feb 16, 2026, 8:55 PM
Active
[WTS] 2023 Omega Seamaster Diver 300M 42mm Steel Summer Blue 210.30.42.20.03.003 Full Set

2023 Omega Seamaster Diver 300M 42mm Steel Summer Blue 210.30.42.20.03.003 Full Set

2023 Omega Seamaster Diver 300M 42mm Steel Summer Blue, a stainless steel automatic diver's watch with a rotating dive bezel and summer blue gradient ceramic dial.

  • Condition: Nice pre-owned condition with some scratches on the case bezel and bracelet
  • Case Material: stainless steel
  • Case Dimensions: 42mm diameter
  • Bezel: stainless steel with blue ceramic insert
Posted at
Feb 6, 2026, 5:22 PM
Active
Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( new / 2024 )

Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( new / 2024 )

This Omega Seamaster 300M 42mm features a Summer Blue dial on a stainless steel bracelet, powered by the Master Co-Axial movement.

  • Condition: Brand new
  • Case size: 42mm
  • Movement type: Master Co-Axial
Posted at
Apr 4, 2025, 2:51 PM
Active
Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( mint )

Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( mint )

Up for sale is a mint condition Omega Seamaster 300M 42mm Summer Blue Dial on Bracelet, complete with all boxes, papers, booklets, hang tag and Omega Warranty Card.

  • Condition: Mint Condition
  • Case size: 42mm
  • Movement type: 8800 Master Co-Axial
  • Shipping cost international: 150
Posted at
Apr 3, 2025, 3:14 PM
Active
Omega Seamaster Diver 30mm Summer Blue 210.30.42.20.03.003

Omega Seamaster Diver 30mm Summer Blue 210.30.42.20.03.003

This Omega Seamaster Diver features a 42mm steel case, blue ceramic bezel, and ceramic blue dial.

  • Condition: Perfect condition
  • Case Size: 42mm diameter
  • Water Resistance: 300m (1000ft)
  • Movement: Omega 8800 self-winding movement
Posted at
Mar 19, 2025, 1:45 PM
Active
Omega Seamaster Diver 300m Summer Blue 210.30.42.20.03.003

Omega Seamaster Diver 300m Summer Blue 210.30.42.20.03.003

This Omega Seamaster Diver 300m features a Summer Blue Dial and comes in great shape, showing only minor hairlines.

  • Condition: mint condition
  • Depth rating: 300m
Posted at
Feb 14, 2025, 2:31 PM
Active
Omega Seamaster 300M SS 42MM Diver Summer Blue Wave Dial 210.30.42.20.03.003 B

Omega Seamaster 300M SS 42MM Diver Summer Blue Wave Dial 210.30.42.20.03.003 B

Up for sale is an Omega Seamaster 300M SS 42MM Diver Summer Blue Wave Dial, in excellent condition. The timepiece includes various accessories such as the inner and outer box, booklet, serial hang tag, pictogram card, master chronometer card, and international Omega warranty card.

  • Condition: Excellent
  • Case Size: 42mm
  • Material: Stainless Steel
Posted at
Feb 3, 2025, 8:00 PM
Active
Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( new / 2024 )

Omega Seamaster 300M - Summer Blue - 42mm - 210.30.42.20.03.003 ( new / 2024 )

This Omega Seamaster 300M 42mm Summer Blue Dial is a brand new watch with all original boxes, papers, and accessories.

  • Condition: Brand new
  • Case material: Stainless steel
  • Movement: 8800 Master Co-Axial
Posted at
Feb 1, 2025, 3:27 PM
Active
[WTS] Omega Seamaster Diver 300M 42mm Black Wave Dial (210.30.42.20.01.001) 2023

Omega Seamaster Diver 300M 42mm Black Wave Dial (210.30.42.20.01.001) 2023

The Omega Seamaster Diver 300M is a 2023 model with a black wave dial, available in 42mm. The watch includes a full set of accessories and an OEM Omega blue rubber deployment bracelet.

  • Condition: excellent condition
  • Bracelet length: all links
  • Included accessories: outer box, inner box, warranty card, Master Chronometer card, pictograms card, card holder, manuals, hang tag
  • Additional bracelet: OEM Omega blue rubber deployment bracelet (previously purchased preowned for $700)
Posted at
Feb 15, 2026, 9:42 PM
Active