Longines HydroConquest Price Guide 2026: Guide Ranges by Reference
Live on eBay
Live Longines HydroConquest listings on eBay right now
Search with category filters, total-cost sort, and seller-quality screening — all in one view.
The Longines HydroConquest is one of the best-value dive watches in Swiss watchmaking. With a ceramic bezel, 300m water resistance, 72-hour power reserve, and a price tag that undercuts comparable Omega and TAG Heuer dive watches by 50% or more, the HydroConquest has earned a loyal following among watch enthusiasts. Here's guide ranges by reference.
To compare a Japanese dive-watch alternative, see the Citizen Promaster Diver guide for light-powered and automatic references and used-buying checks.
HydroConquest Guide Ranges
| Reference | Model | Guide Range |
|---|---|---|
| L3.780.4 (39mm) | HydroConquest Auto 39mm | $700 – $1,200 |
| L3.781.4 (41mm) | HydroConquest Auto 41mm | $800 – $1,400 |
| L3.782.4 (43mm) | HydroConquest Auto 43mm | $900 – $1,500 |
| L3.890.4 | HydroConquest GMT | $1,200 – $1,800 |
| L3.883.4 | HydroConquest Chrono | $1,000 – $1,600 |
* Guide ranges only. Prices vary by condition, box/papers, and seller.
Search Live HydroConquest Listings
See every Longines HydroConquest currently listed on eBay with current listing prices, seller ratings, and location data.
What Makes the HydroConquest Special
300m Water Resistance
The HydroConquest is a true dive watch with 300 meters of water resistance, a screw-down crown, and a unidirectional ceramic bezel — the same depth rating as the Rolex Submariner at a fraction of the price.
72-Hour Power Reserve
The L888 caliber delivers an impressive 72-hour power reserve — 80% more than the standard ETA 2824. Leave it off your wrist for a full weekend and it will still be running Monday morning.
Exceptional Value
A ceramic-bezel, 300m-rated Swiss dive watch with a 72-hour movement for under $1,500 pre-owned. Comparable Omega Seamaster and Tudor Pelagos models cost 3-5x more for similar specifications.
Silicon Balance Spring
Current HydroConquest models feature a silicon balance spring that resists magnetic fields and improves long-term accuracy, a feature typically found in watches costing $3,000+.
Authentication Tips
The ceramic bezel should have crisp, clearly defined numerals — Longines uses high-quality ceramic inserts with PVD-filled markings.
Check the display caseback for the properly branded L888 or L844 (GMT) movement with Longines-signed rotor.
The winged hourglass logo on the dial should be sharply printed with clean edges — blurry logos indicate counterfeits.
Verify the serial number on the caseback matches the warranty card. Longines provides a 5-year international warranty.
The screw-down crown should operate smoothly and create a firm seal — loose or wobbly crowns indicate a fake or damaged watch.
Related Guides
Frequently Asked Questions
How much does a Longines HydroConquest cost on eBay?
Longines HydroConquest guide ranges run from about $500 for older quartz references to $1,800 for the current-production GMT model. The most popular 41mm automatic (L3.781.4) has a guide range of $800-$1,400 pre-owned with box and papers. This makes it one of the most affordable ceramic-bezel dive watches from a major Swiss brand.
Is the Longines HydroConquest a good dive watch?
The HydroConquest is an excellent dive watch for its price point. It offers 300m water resistance, a unidirectional ceramic bezel, screw-down crown, and the reliable L888 automatic movement with a 72-hour power reserve. While it doesn't match the Rolex Submariner's bracelet quality or in-house movement pedigree, it delivers 90% of the capability at roughly 10% of the price.
What movement is in the Longines HydroConquest?
Current HydroConquest automatic models use the Longines L888 caliber, based on the ETA A31.L01. This movement features a 72-hour power reserve (vs 40 hours for standard ETA), a silicon balance spring for improved accuracy and magnetic resistance, and is regulated to chronometer-grade standards. The GMT variant uses the L844 with an additional GMT hand.
HydroConquest 39mm vs 41mm vs 43mm — which size should I get?
The 39mm (L3.780.4) suits wrists under 7 inches and those who prefer a vintage-proportioned dive watch. The 41mm (L3.781.4) is the most versatile and best-selling size — it wears well on most wrists and is slim enough for business casual. The 43mm (L3.782.4) is ideal for larger wrists or those who want maximum dial legibility. All three share the same movement and 300m water resistance.
Ready to Find Your HydroConquest?
Search real-time eBay listings with AuctionMapper's powerful tools.
Related guides
- Longines Watches: Complete Price Guide & Buyer's Guide 2026
- Tissot Watches: Complete Price Guide & Buyer's Guide 2026
- Tissot PRX Price Guide 2026 — guide price ranges
- IWC Watches: Complete Price Guide & Buyer's Guide 2026
- Seiko Watches: Complete Price Guide & Buyer's Guide 2026
- TAG Heuer Watches: Price Guide & Buyer's Guide 2026
- Watch brand and buying guides