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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Omega’s gradient turquoise Aqua Terra 150M is available in two steel-case sizes: 38 mm and 41 mm. Both pair a lacquered turquoise dial that fades to black with 150 m water resistance, a date display and sapphire crystal. The practical choice comes down to wrist proportions, strap configuration and movement: the 38 mm uses calibre 8800, while the 41 mm adds calibre 8900’s independent quick-set hour hand and a five-hour longer power reserve.
What’s different between the 38 mm and 41 mm?
The 38 mm is shorter, thinner and fitted with a smaller movement reserve. The 41 mm takes up more space on the wrist and offers a useful travel function: its local hour hand can be adjusted independently. Dimensions below are hands-on measurements reported by Monochrome; movement and launch-price details are reported by Fratello Watches.
| Feature | 38 mm | 41 mm |
|---|---|---|
| Steel-bracelet reference | 220.10.38.20.03.005 | 220.10.41.21.03.006 |
| Case dimensions | 38 × 12.4 × 44.9 mm | 41 × 13.3 × 47.9 mm |
| Movement | Omega calibre 8800 | Omega calibre 8900 |
| Power reserve | 55 hours | 60 hours |
| Independent quick-set hour hand | Not stated by Fratello Watches | Yes; reported by Monochrome |
| Launch price for steel-bracelet model | CHF 6,300 / €7,300 / US$6,600, as reported by Fratello Watches | CHF 6,300 / €7,300 / US$6,600, as reported by Fratello Watches |
The 38 mm case has a 44.9 mm lug-to-lug length and 12.4 mm thickness; the 41 mm measures 47.9 mm lug to lug and 13.3 mm thick. Those differences matter as much as the diameter: the larger watch extends farther across the wrist and sits slightly taller. Try to compare the watches on wrist if possible, especially if your wrist is narrow or you prefer a compact fit.
How do the movements differ?
38 mm: calibre 8800
The 38 mm model uses Omega calibre 8800 and has a 55-hour power reserve. Omega’s regional product page specifies the movement and reserve for its 38 mm turquoise model. Fratello Watches reports that the steel-bracelet reference is METAS-certified as a Master Chronometer and antimagnetic to 15,000 gauss.
#1 Best Overall
- Omega Seamaster Aqua Terra Automatic Men's Watch 220.10.41.21.01.001
41 mm: calibre 8900
The 41 mm uses calibre 8900, with twin barrels and a 60-hour reserve, according to Monochrome. Its independent quick-set hour hand lets you move the local hour forward or back without resetting the minutes, a practical advantage when changing time zones. Fratello Watches reports the 41 mm steel-bracelet reference is also a METAS-certified Master Chronometer and antimagnetic to 15,000 gauss.
What are the dial, case and water-resistance specifications?
Both sizes have a lacquered turquoise dial that fades to a black gradient, grey-treated hands and indexes, and white Super-LumiNova. The date sits at 6 o’clock on the configurations described by Omega and Watches of Switzerland. The gradient and vivid turquoise give the watch a more pronounced look than a conventional dark or neutral-dial Aqua Terra, while the grey details keep the markers visually distinct.
Rank #2
- Model 220.12.38.20.03.001
Omega specifies 15 bar of water resistance for the 38 mm model, equivalent to 150 m or 500 ft. Monochrome reports 150 m water resistance for both sizes, along with domed, scratch-resistant sapphire crystals with anti-reflective treatment, screw-in crowns and casebacks. These are published specifications, not the result of independent testing for this article.
Bracelet or black rubber strap?
The steel-bracelet references are 220.10.38.20.03.005 (38 mm) and 220.10.41.21.03.006 (41 mm). Monochrome describes the bracelets as having comfort-release folding clasps. Omega’s regional page also describes the 38 mm turquoise model on a black rubber strap with turquoise stitching. Watches of Switzerland lists a 41 mm steel-and-rubber configuration with a black textured strap and teal stitching.
Rank #3
- Omega Seamaster Aqua Terra Automatic Chronometer Watch 220.10.38.20.02.001
Strap availability and compatibility depend on the exact reference and market. Check the reference and fitting with Omega or the retailer before buying a separate strap; a strap listed for one case size should not be assumed to fit the other.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much does the turquoise Aqua Terra cost?
Fratello Watches reported launch prices for the steel-bracelet models of CHF 6,300, €7,300 and US$6,600. These are launch figures, not a guarantee of current retail pricing. The price you see now can vary by country, configuration and retailer, and the available material does not establish current local pricing or inventory. Confirm the price and reference with an Omega boutique or authorized retailer in your market.
Quick Recap
Best Value
- Omega Seamaster Aqua Terra Chronometer Automatic Men's Watch 220.10.41.21.02.001
Rank #4
- Omega Seamaster Aqua Terra Automatic Blue Dial Men's Watch 220.10.38.20.03.001
Which size should you choose?
- Choose 38 mm if you want the more compact proportions, lower thickness and shorter lug-to-lug measurement, or prefer the 8800-equipped configuration.
- Choose 41 mm if you prefer a larger wrist presence and value the calibre 8900’s independent hour adjustment for travel, along with its 60-hour power reserve.
- Choose by configuration as well as size: compare the exact bracelet or rubber-strap reference, since options and availability can differ by region.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
