Longines HydroConquest Automatic vs Tissot Seastar 1000 Automatic
Two divers compared — $1,500–$2,500 vs $500–$1,000
Quick Verdict
The Tissot Seastar 1000 Automatic ($500–$1,000) delivers ETA/Tissot Automatic technology in the tier below the Longines HydroConquest Automatic ($1,500–$2,500). The Seastar 1000 Automatic measures 40mm and is rated 300m (30 ATM). The HydroConquest Automatic justifies its premium with Swiss Made heritage and Automatic L888.5. Both represent excellent choices in the diver category.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Longines HydroConquest Automatic | Tissot Seastar 1000 Automatic |
|---|---|---|
| Price | $1,500–$2,500 | $500–$1,000 |
| Case Size | 41mm | 40mm |
| Movement | Automatic L888.5 | Automatic Powermatic 80 (Caliber 80.111) |
| Caliber Type | ETA-Based Automatic with Silicon Balance Spring | ETA/Tissot Automatic |
| Power Reserve | 72 Hours | 80 Hours |
| Water Resistance | 300m (30 ATM) | 300m (30 ATM) |
| Crystal | Sapphire with Anti-Reflective Coating | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Longines's design language vs Tissot's approach
The Longines HydroConquest Automatic features a Stainless Steel case at 41mm with Sapphire with Anti-Reflective Coating protection. The Tissot Seastar 1000 Automatic offers Stainless Steel construction at 40mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic L888.5 vs Automatic Powermatic 80 (Caliber 80.111)
The HydroConquest Automatic runs the Automatic L888.5 (ETA-Based Automatic with Silicon Balance Spring, 72 Hours power reserve) at 25,200 vph (3.5 Hz) frequency. The Seastar 1000 Automatic uses the Automatic Powermatic 80 (Caliber 80.111) (ETA/Tissot Automatic, 80 Hours reserve) at 21,600 vph (3 Hz). The Seastar 1000 Automatic offers a longer power reserve.
Wearability & Fit
41mm vs 40mm — different wrist presence
At 41mm, the HydroConquest Automatic has a bolder wrist presence compared to the Seastar 1000 Automatic at 40mm. Water resistance differs: 300m (30 ATM) vs 300m (30 ATM).
Value & Cost of Ownership
Tissot sits in the lower tier
The Longines HydroConquest Automatic sits at $1,500–$2,500 and the Tissot Seastar 1000 Automatic at $500–$1,000. On the specs that outlast any price: the HydroConquest Automatic uses Sapphire with Anti-Reflective Coating with 72 Hours, against Sapphire Crystal and 80 Hours on the Seastar 1000 Automatic. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 300m (30 ATM)
The HydroConquest Automatic is rated to 300m (30 ATM) while the Seastar 1000 Automatic handles 300m (30 ATM). Both offer identical water resistance ratings.
Our Verdict
Longines
HydroConquest Automatic
Choose the Longines HydroConquest Automatic if you prioritize ETA-Based Automatic with Silicon Balance Spring engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $1,500–$2,500, it delivers Automatic L888.5 with 72 Hours power reserve.
Check Price on AmazonTissot
Seastar 1000 Automatic
Choose the Tissot Seastar 1000 Automatic if you value ETA/Tissot Automatic technology, Swiss Made heritage, and 40mm proportions. At $500–$1,000, the Automatic Powermatic 80 (Caliber 80.111) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Longines HydroConquest Automatic and Tissot Seastar 1000 Automatic represent two distinct approaches to the diver category — the Longines bringing Swiss Made tradition while Tissot delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Tudor Black Bay 58 vs Longines HydroConquest
Is the price jump to Tudor justified?
Hamilton Khaki Field Mechanical vs Longines HydroConquest
A hand-wound field watch against a 300m Swiss diver
Tag Heuer Carrera Chronograph vs Longines HydroConquest Automatic
Tag Heuer's chronograph meets Longines's diver
Explore These Watches
How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.