Omega
Seamaster Aqua Terra 38
220.10.38 · 38mm · 150m
Master Chronometer go-anywhere watch. 150m water resistance.
Both Swatch Group, very different positioning
Omega and Tissot sit at the top and bottom of Swatch Group's mechanical-watch ladder. Both share movement engineering DNA: the Tissot Powermatic 80 is an ETA C07-derived movement with silicon balance spring and 80-hour reserve. The Omega Aqua Terra runs the co-axial METAS Master Chronometer Cal. 8800.
The brief is similar: 38-40mm steel sport watch, 100-150m water resistance, daily-wear positioning, mechanical automatic. The price gap is 8x. The PRX broke the under-€700 integrated-bracelet category open in 2021; the Aqua Terra remains the reference point for €5K-tier Swiss versatile-sport.
Spec sheet
| Attribute | Omega Seamaster Aqua Terra 38 | Tissot PRX Powermatic 80 |
|---|---|---|
| Reference | 220.10.38 | T137 |
| Case diameter | 38mm × 12.4mm | 40mm × 10.4mm |
| Case material | Stainless steel | Stainless steel |
| Bezel | Smooth fixed | Smooth tonneau (integrated) |
| Bracelet | Three-link Oyster-style | Integrated tapered |
| Movement | Cal. 8800 (METAS Master Chronometer) | Powermatic 80 (ETA C07-derived) |
| Beat rate | 25,200 vph (3.5 Hz) | 21,600 vph (3 Hz) |
| Reserve | 55 hours | 80 hours |
| Hairspring | Si14 silicon | Nivachron |
| Antimagnetic | 15,000 gauss (METAS) | Standard |
| Water resistance | 150m | 100m |
| Retail price | ~€5,800 | ~€695 |
8x price gap, where does it go?
The Aqua Terra's €5,800 buys: METAS Master Chronometer certification (an industry-leading antimagnetic and accuracy standard), in-house co-axial Cal. 8800, 150m water resistance, hand-finishing on case and dial, sapphire caseback, premium bracelet quality. The Tissot's €695 gives you a different proposition: silicon hairspring at the lowest mechanical-watch price tier, the same Swatch movement architecture in a less-finished form, and an integrated bracelet that nobody else priced this aggressively.
Movements: Master Chronometer vs Powermatic 80
The Aqua Terra's Cal. 8800 is METAS-certified, accurate to ±5 seconds/day across temperatures, and antimagnetic to 15,000 gauss. Service interval ~10 years. The Powermatic 80 is COSC-grade in spec but not certified, with 80h reserve and silicon balance spring at this price tier. Different watch-buying cultures: spec-buyer vs precision-buyer.
Integrated bracelet vs Oyster-style
The PRX's integrated bracelet is its signature: case and bracelet are one design, no spring bars, taper from lug-width to clasp-width. The Aqua Terra wears a more-traditional three-link bracelet with spring bars (some references on rubber). On the wrist, the PRX feels more "luxury sport" silhouette; the Aqua Terra reads as "premium dress-sport." The PRX hits the Genta-style integrated-bracelet brief at €695.
Pros and cons
Seamaster Aqua Terra 38 · Pros
- METAS Master Chronometer certification
- 15,000-gauss antimagnetic resistance
- 150m water resistance
- Co-axial escapement (10-year service interval)
- Premium hand-finishing
Seamaster Aqua Terra 38 · Cons
- 8x the PRX's retail price
- No integrated-bracelet option
- 55h reserve vs the PRX's 80h
PRX Powermatic 80 · Pros
- 80-hour power reserve
- Integrated-bracelet design at €695
- Silicon balance spring (anti-magnetic)
- Available in multiple dial colours
- Genuinely good wear-and-tear feel for the price
PRX Powermatic 80 · Cons
- No COSC / METAS certification
- 100m water resistance ample but lower
- Less hand-finishing than the Aqua Terra
- Stamped clasp vs CNC-milled at higher tiers
Verdict: which one?
If you want a spec-leading everyday Swiss automatic: Aqua Terra. METAS, co-axial, antimagnetic, ten-year service interval. €5,800 is fair for the engineering.
If you want a genuinely-good integrated-bracelet sport at the entry tier: PRX 40 205. €695 retail is not a typo. Silicon hairspring, 80h reserve, integrated bracelet.
PRX is the entry-tier answer; Aqua Terra is the destination. Many buyers buy a PRX first, fall in love with the integrated-bracelet silhouette, and upgrade upward (often to Aqua Terra, sometimes to Royal Oak / Nautilus).
Common questions
Why is the Omega Aqua Terra eight times the price of the Tissot PRX?
The Aqua Terra ~€5,800 buys METAS Master Chronometer certification, an in-house co-axial Cal. 8800, 150m water resistance, 15,000-gauss antimagnetic resistance, hand-finishing and a sapphire caseback. The PRX ~€695 gives you the same Swatch-Group movement architecture in a less-finished Powermatic 80 form, a Nivachron hairspring, and an integrated bracelet nobody else priced this aggressively.
Which has the longer power reserve, the Aqua Terra or the PRX?
The Tissot PRX Powermatic 80 holds 80 hours, beating the Aqua Terra 55 hours. The Aqua Terra runs at 3.5 Hz versus the PRX 3 Hz and adds METAS certification plus a 15,000-gauss antimagnetic rating the PRX does not carry.
Does the Tissot PRX have an integrated bracelet like a Royal Oak?
Yes - the PRX is defined by its integrated bracelet: case and bracelet are one design with no spring bars, tapering from the lugs to the clasp, reviving the 1978 Tissot original. The Aqua Terra wears a more traditional three-link bracelet on spring bars, so it reads as premium dress-sport rather than the Genta-style integrated-bracelet silhouette.
Is the PRX a good first mechanical watch before stepping up to an Aqua Terra?
For many buyers, yes. People often start with a PRX at ~€695, fall for the integrated-bracelet look, and later upgrade - frequently to the Aqua Terra, sometimes further to a Royal Oak or Nautilus. The PRX is the entry-tier answer; the Aqua Terra is the destination.
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