The HydroConquest is the easiest way into a “real” luxury-brand dive watch. It has a ceramic bezel, 300 m water resistance, a 72-hour movement with a silicon balance spring and a bracelet with an extension clasp. Longines has been building watches since 1832, and the HydroConquest gives you that pedigree at a fraction of the price of the big names.
Who it’s for
Buyers stepping up from Seiko or Tissot who want a polished Swiss diver for daily wear without Rolex or Omega pricing.
Buying tips
- Dials (black, blue, green, sunray gray) and sizes (39, 41, 43 mm) vary. Confirm the listing’s reference.
- Pre-owned prices are often well below retail. This is a strong used buy.
- Check for original box and papers. They matter more at this price for resale.
| Brand | Longines |
|---|---|
| Reference | L3.781.4 series (and variants) |
| Case size | 41 mm |
| Case material | Stainless steel, ceramic bezel insert |
| Movement | Automatic, Longines L888 |
| Power reserve | About 72 hours |
| Water resistance | 300 m |
| Crystal | Sapphire |
| Production | Current generation from 2018 |
| Typical market price | around $1,800 (estimate; see tracked prices) |
Longines HydroConquest 41mm price history
How we measure: eBay figures are the median of matching US listings after removing accessories, parts and statistical outliers. "Asking" means listed prices; "sold" means completed sales. Retailer prices are spot checks. Prices change constantly; confirm on the retailer's site.
