Omega
Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001
The Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet (reference 231.55.39.21.51.001) is a 38.5 mm red Gold watch with a black dial. It runs on the automatic caliber 8501 and is water resistant to 150 m.
Specifications
Case
- Reference
- 231.55.39.21.51.001
- Collection
- Seamaster Aqua Terra
- Case size
- 38.5 mm
- Case material
- Red Gold
- Water resistance
- 150 m
- Bracelet / strap
- Red Gold
Dial and bezel
- Dial
- Black
Movement
- Movement
- Automatic
- Caliber
- 8501
Dial versions
This reference was made with these dials and finishes.
231.55.39.21.51.001 Black
Gem-Set Indexes · Gem-set (details not stated)
How it compares within the Seamaster Aqua Terra family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 231.55.39.21.51.001 (This watch) | 38.5 mm | Red Gold | Black | 8501 | — |
| 220.10.41.21.03.003 | 41 mm | Stainless Steel | Blue | 8900 | 2019– |
| 220.10.41.21.03.004 | 41 mm | Stainless steel | Blue | 8900 | 2019– |
| 220.93.43.22.99.001 | 43 mm | Platinum | Silver | 8939 | 2017– |
| 231.10.34.20.55.003 | 34 mm | Stainless Steel | Silver | 8520 | 2016– |
| 231.10.42.21.02.005 | 41.5 mm | Stainless Steel | Silver | 8500 | 2016–2016 |
| 231.10.42.21.03.004 | 41.5 mm | Stainless Steel | Blue | 8500 | 2015– |
| 522.10.42.21.03.001 | 41.5 mm | Stainless Steel | Blue | 8500 | 2016– |
| 522.12.41.21.03.001 | 41 mm | Stainless Steel | Blue | 8900 | 2019– |
About the Seamaster Aqua Terra family
The Aqua Terra joined the Seamaster family in the early 2000s as a versatile everyday watch with 150 metres of water resistance and a dressier look than Omega's dive models. Its teak-pattern dial, inspired by the decks of sailing yachts, is the line's signature, and since the 2017 update the stripes run horizontally.
The catalog holds a very wide range: men's sizes such as 38 and 41 mm, smaller ladies' sizes, GMT and Worldtimer versions, and cases in steel, titanium and several gold alloys. Modern models use Master Chronometer calibers such as the 8900. Dealers identify a piece by its full reference, which gives size, metal, movement and dial colour, since many variants look alike.
Quick answers
- What size is the Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001?
- The Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001 has a 38.5 mm case.
- What movement does the Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001 use?
- It uses the automatic caliber 8501.
- How water resistant is the Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001?
- It is water resistant to 150 metres.
- What is the Omega Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black / Bracelet 231.55.39.21.51.001 made of?
- The case is red Gold. Bracelet or strap: Red Gold.
Catalog facts checked October 2026.