Strap for Hydroconquest Quartz 39 Black

The lug width of the Longines HydroConquest L3.640.4.56.6 is 20mm. This measurement indicates the internal distance between the two lugs of the case where the strap is installed. When purchasing a compatible strap, ensure that the total width measured internally between the passants is exactly 20mm, verified with a digital calliper to avoid friction during installation.

For the HydroConquest we recommend a balance between protection and elegance: vegetable-tanned calf leather for daily and formal wear, as it absorbs controlled humidity and develops natural patina over time; alligator with scales on the inside for formal contexts; German-tanned shell cordovan for those desiring durability and resistance to ageing. For actual marine use, synthetic rubber or NATO straps with elastic passants offer practicality. The optimal solution involves two interchangeable straps.

Strap replacement is achieved by extracting the spring bars (horizontal pins anchoring the strap to the case). Use a spring bar tool: insert the flat tip under the spring bar end toward the lower passant, pushing downward to release the internal spring. Once loosened, remove the old strap. For installation of the new one, align the passants with the lug and reinsert the spring bars, ensuring both sides are anchored correctly.

Yes, any strap with a 20mm lug width is compatible with the Longines HydroConquest L3.640.4.56.6. Artisanal aftermarket straps offer greater aesthetic customisation and construction quality compared to OEM straps. We recommend verifying that the new strap does not undergo deformation during installation and that the passants fit perfectly to the lug to avoid excessive play.

A leather strap with vegetable or shell cordovan tanning has an average lifespan of 2-3 years with intensive daily use, extendable to 4-5 years with moderate use (2-3 days weekly) and rotation with other straps. Durability depends on external factors: sun exposure, repeated water contact, perspiration, extreme temperatures. A leather strap should be left to air dry naturally after water contact and protected with protective creams every 6 months. Wear of the passants is the first indicator of necessary replacement.