Longines
HydroConquest L3.790.4.06.6— lug 21mm
Longines HydroConquest L3.790.4.06.6: 21mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 21mm lug width to preserve the original sartorial balance."
Technical Specifications
Longines L3.790.4.06.6The essential strap measurement.
Browse 21mm straps →L3.790.4.06.6
Longines caliber L844.4 Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) | Date
The Heritage
Compatible Straps
Selected for the 21mm lug width of the HydroConquest
FAQ
What is the lug width of the Longines HydroConquest L3.790.4.06.6?
The lug width of the Longines HydroConquest L3.790.4.06.6 is 21mm. This measurement represents the internal space between the lugs where the strap is fitted. Compatibility verification is essential before purchasing an aftermarket strap, as this model tolerates no variations in dimensional accuracy.
Which strap do you recommend for the Longines HydroConquest L3.790.4.06.6?
Choice depends on intended use. For formal occasions, we recommend alligator in mahogany brown or cognac: it develops natural patina over time whilst maintaining elegance. For robust daily wear, Italian vegetable-tanned calf offers pronounced texture and visible ageing. For intensive diving activities, vulcanised rubber or canvas NATO straps deliver absolute practicality and zero maintenance requirements.
How do you change the strap on the Longines HydroConquest L3.790.4.06.6?
Strap changing requires a specialist tool (spring bar remover) or a thin screwdriver to extract the lateral pins. Position the watch on a soft surface, insert the pin from one side with precision, remove the worn strap, and seat the new one sequentially. We recommend entrusting this procedure to a specialist atelier to prevent case scratches: Casati Milano offers this service by appointment in Milan.
Are 21mm straps from other manufacturers compatible with the Longines HydroConquest L3.790.4.06.6?
Yes, provided the lug width is precisely 21mm and the constructive thickness is proportionate to the 41mm case. A generic 21mm strap of inferior quality may exhibit slippage or instability. Milano Straps selects only straps verified for mechanical and aesthetic compatibility with this model, guaranteeing zero tolerance on width and spring bar housing.
How long does a natural leather strap last on the Longines HydroConquest L3.790.4.06.6?
Durability depends on intensity of wear and maintenance routine. An alligator or Italian vegetable-tanned calf, with moderate daily use and periodic cleaning, lasts 18–24 months before replacement is necessary. Constant exposure to water, perspiration, and humidity significantly shortens serviceable life. Vulcanised rubber and NATO straps, conversely, exceed 3–4 years of intensive use without aesthetic degradation. Casati Milano provides an 18-month warranty on all custom straps.