Longines
HydroConquest L3.788.4.99.6
39mmCurrent Production
Retail: $2,400
The HYDROCONQUEST collection blends modern aesthetics with proven performance. Powered by an exclusive LONGINES automatic calibre, water-resistant up to 30 bar (300 m), with unidirectional bezel, screw-in crown and screw-down case back. Automatic watch, Ø 42.00 mm, stainless steel and ceramic bezel, L3.788.4.99.6 Date, self-winding mechanical movement beating at 25'200 vibrations per hour, with a monocrystalline silicon balance-spring power reserve up to 72 hours.
Source: Longines website, last updated Mar 2026
Other References in this Collection
More Longines Forum Listings
![[WTS] Longines Heritage 1940 Ref. L2.767.4.13.2 | Excellent Condition (with Box, Booklet, Card) | $1350](/_next/image?url=https%3A%2F%2Fi.redd.it%2Ft547yrdnpwrg1.jpg&w=1200&q=75)
![[WTS/WTT] Longines Master Collection 2023 Moonphase excellent cond $1350](/_next/image?url=https%3A%2F%2Fi.redd.it%2Fxqutver53wrg1.jpg&w=1200&q=75)
Longines HydroConquest — eBay Listings
More Longines Watches
Spirit Zulu Time
L3.812.4.53.6 · 42mm'Spirit Zulu Time 42 Black / Bracelet'
Spirit Zulu Time
L3.812.4.63.6 · 42mm'Spirit Zulu Time 42 Grey / Bracelet'
HydroConquest GMT
L3.890.4.96.6 · 41mm'Hydroconquest GMT 43 Stainless Steel / Blue / Bracelet'
Conquest Chronograph
L3.835.4.98.9 · 42mm
Master Collection Moonphase
L2.409.5.89.7 · 34mm
Master Collection
L2.893.4.92.6 · 40mm![[WTS] LONGINES TUXEDO- L2.830.4.93.0](/_next/image?url=https%3A%2F%2Fi.redd.it%2Fnt1h97j8nnrg1.jpg&w=1200&q=75)
![[WTS] Longines Legend Diver 36mm | Near Mint | Longines Mesh Bracelet | $1,650 Shipped](/_next/image?url=https%3A%2F%2Fi.redd.it%2Ftwowzt9jgmrg1.jpg&w=1200&q=75)
