The HydroConquestAutomatic Black Dial 39mm L37804566 (Reference L37804566) is a Steel cased luxury wristwatch by Longines introduced in 2025. The case measures 39 mmmm with a Black dial on a Steel bracelet. Powered by a Automatic movement.

On TheWatchInfo, the HydroConquestAutomatic Black Dial 39mm L37804566 is tracked across the secondary market in real time. There are currently 1 active listing with an average asking price of $1,595. Listings are sourced from Dealer. Price history, trend analysis, and condition breakdowns are available on this page.

Longines watches are among the most actively traded on the pre-owned market. The HydroConquestAutomatic Black Dial 39mm L37804566 Ref. L37804566 is sought after by collectors for its steel case construction and black dial. Buyers and sellers use TheWatchInfo to track real-time price movements, compare listings across platforms, and understand fair market value before transacting.

When purchasing a pre-owned HydroConquestAutomatic Black Dial 39mm L37804566 Ref. L37804566, key factors to consider include the condition grade (unworn, mint, excellent, good), presence of original box and papers, service history, and whether the watch has been modified. Prices for examples with full box and papers typically command a 10–20% premium over card-only or watch-only examples. Use the listings and price history on this page to benchmark what a fair price looks like right now.