Omega Aqua Terra Seamaster Aqua Terra 150M Co-Axial 34 Stainless Steel / Diamond / MOP

Reference 231.18.34.20.55.001

About this watch

The Omega Seamaster Aqua Terra 231.18.34.20.55.001 is a masterpiece of luxury watchmaking, blending elegance with precision in a stunning package. Crafted from stainless steel and adorned with diamond accents, this 34mm timepiece exudes sophistication and refinement. The Mother of Pearl dial shines with an iridescent quality, while the gem-set indexes add a luxurious touch. Powered by the Omega caliber 8521 movement, this watch boasts accurate timekeeping and a remarkable power reserve of 50 hours. With its robust stainless steel case and scratch-resistant sapphire crystal, it's built to withstand the elements. Whether you're swimming, snorkeling, or just enjoying everyday wear, this Aqua Terra is the perfect companion. Its versatile design effortlessly transitions from casual to formal occasions, making it a staple in any wardrobe.
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Key Features

  • Omega caliber 8521 movement
  • Mother of Pearl dial with gem-set indexes
  • Water resistance up to 150 meters
  • Automatic winding and Co-Axial escapement for accurate timekeeping
  • Scratch-resistant sapphire crystal
  • Robust stainless steel case
  • 50-hour power reserve

Specifications

Brand
Omega
Family
Aqua Terra
Model
Seamaster Aqua Terra 150M Co-Axial 34 Stainless Steel / Diamond / MOP
Reference
231.18.34.20.55.001
Movement
8521
Movement Features
  • Hours, Minutes, Seconds
  • Date
  • Chronometer, Co-Axial Escapement
Case
Stainless Steel 34mm
Dial Color
White
Crystal
Sapphire
Water Resistance
150

Current Listings

[WTS] Omega Seamaster Aqua Terra 2023 41mm Grey 220.10.41.21.06.001 Full Set - $5,495

Omega Seamaster Aqua Terra 2023 41mm Grey 220.10.41.21.06.001 Full Set - $5,495

This Omega Seamaster Aqua Terra Grey is a 2023 model, featuring a 41mm case.

  • Condition: Excellent condition with minimal signs of wear
  • Case Size: 41mm diameter
Posted at
Feb 14, 2026, 12:02 PM
Active
[WTS] Omega Seamaster Aqua Terra 36mm 2504.80 Full Set

Omega Seamaster Aqua Terra 36mm 2504.80 Full Set

Omega - 2504.80 · $3,700
Omega Seamaster Aqua Terra 36mm watch in great condition, with a deployant rubber strap from Helvetus.

  • Condition: Great condition with minor wear
  • Bracelet condition: minor wear
Posted at
Feb 14, 2026, 11:21 AM
Active
[WTS] Omega Aqua Terra 220.10.41.21.10.001 — 09/2025 Full Set — $4795 Shipped obo

Omega Aqua Terra 220.10.41.21.10.001 — 09/2025 Full Set — $4795 Shipped obo

Up for sale is my Omega Aqua Terra 41mm in excellent condition, featuring a stunning green teak dial and Master Chronometer Co-Axial movement.

  • Condition: Excellent
  • Size: 41mm diameter
  • Year: 2025
  • Water resistance: 150m
Posted at
Feb 14, 2026, 12:17 AM
Active
[WTS] Omega Seamaster Aqua Terra 150m 38.5mm

Omega Seamaster Aqua Terra 150m 38.5mm

This Omega Seamaster Aqua Terra is a steel on steel model, featuring a 38.5mm case and 150m water resistance.

  • Condition: Very good condition
  • Water Resistance: 150m depth rating
  • Case Size: 38.5mm diameter
  • Bracelet Links: includes all removable links plus an extra half-link
Posted at
Feb 13, 2026, 9:46 PM
Active
[WTS] Omega Aqua Terra 2015 38.5mm 231.10.39.21.02.001 B&P

Omega Aqua Terra 2015 38.5mm 231.10.39.21.02.001 B&P

Aqua Terra 2015 model, 38.5mm diameter, suitable for everyday wear with versatile style.

  • Condition: Excellent condition
  • Size: 38.5mm diameter
Posted at
Feb 13, 2026, 4:28 PM
Active
[WTS] Omega Seamaster Aqua Terra Quartz - White Dial - 231.10.39.61.02.001 - Price Reduced!

Omega Seamaster Aqua Terra Quartz - White Dial - 231.10.39.61.02.001 - Price Reduced!

This Omega Seamaster Aqua Terra Quartz features a white dial and is powered by a quartz movement, coming on its original stainless steel bracelet.

  • Condition: pre-owned with minor wear
  • Size: 38.5mm diameter
  • Movement: quartz
  • Bracelet material: stainless steel
Posted at
Feb 13, 2026, 12:58 PM
Active
[WTS] Omega Seamaster Aqua Terra – Annual Calendar – 38.5mm Blue Dial

Omega Seamaster Aqua Terra – Annual Calendar – 38.5mm Blue Dial

Omega - 23110392203001 · $4,400
The Omega Seamaster Aqua Terra features a 38.5mm stainless steel case on a stainless steel bracelet, with an annual calendar complication that automatically accounts for months with 30 or 31 days.

  • Condition: Excellent condition
  • Case size: 38.5mm diameter
  • Movement: Omega Co-Axial calibre 8601
Posted at
Feb 13, 2026, 11:38 AM
Active
[WTS] 2023 Omega Aqua Terra - Weave Dial

2023 Omega Aqua Terra - Weave Dial

A 2023 Omega Aqua Terra watch featuring a black weave dial and rose gold colored hands/makers.

  • Condition: Very Good
  • Case size: 41.5mm diameter
  • Box condition: Outer Box / Inner Box / Warranty Card / Pictograms Card / Manual - Front flap loose / some wear marks
Posted at
Feb 12, 2026, 9:54 PM
Active
[WTS] Omega Seamaster Aqua Terra 38 Green 220.12.38.20.10.001 MINT REDUCED

Omega Seamaster Aqua Terra 38 Green 220.12.38.20.10.001 MINT REDUCED

A Omega Seamaster Aqua Terra 38 in mint condition, with box and papers included.

  • Condition: Mint
  • Original Strap: Original omega strap
  • Leather Strap Depth Rating: 200m water resistant (TUNS green leather strap)
  • Warranty: Watchmaxx warranty
Posted at
Feb 12, 2026, 8:16 PM
Active