Description
The Longines HydroConquest 39mm represents the pinnacle of professional dive watch engineering, combining contemporary design with exceptional reliability. Equipped with the exclusive L888 automatic calibre, this timepiece delivers robust performance with 300-metre water resistance, reinforced by a unidirectional ceramic bezel, screw-in crown, and secured case back, essential features for serious water sports enthusiasts and collectors alike.
Features:
Calibre: L888
Movement: Self-winding mechanical movement beating at 25'200 vibrations per hour, with a monocrystalline silicon balance-spring
Power Reserve: Approx 72 hours
Functions: Hours, minutes, seconds and date
Dial: Black lacquered polished
Bezel: Black ceramic, unidirectional rotating
Crown: Screw-in crown
Thickness: 11.70 mm
Product Weight (Approx.): 155.0 g
Longines Watches are also available in our Ipswich and Windsor stores.
Specification
Shipping & Returns
We are proud to offer free UK delivery on orders of £101 and over placed on our website. Robert Gatward Jewellers currently only operates and supplies within the United Kingdom.
Orders placed before 12pm Tuesday–Friday will be dispatched the same day (stock permitting). Orders placed after 12pm on Friday through to Monday will be dispatched on Tuesday. If there is a specific day you would like to receive your order, please let us know as soon as you have placed it and we will do our best to accommodate.
Orders totalling £101 or more will be posted using Royal Mail Special Delivery. Orders totalling less than £101 will be posted using Royal Mail 1st Class Signed For Delivery (1–2 working days). Although next‑day delivery cannot be guaranteed with this service, the majority of these orders arrive the following working day, including Saturdays in many cases.
For delivery information regarding Engagement Rings, please click here.


