Strap for Hydroconquest Chronograph Quartz

The Longines HydroConquest L3.643.4.96.6 features a 21mm lug width. This dimension is the standard for 41mm case diameters and accommodates leather, rubber, and technical fabric straps with substantial thickness. To verify the measurement, position a digital calliper perpendicularly between the two lug attachments.

We recommend straps in alligator or vegetable-tanned calf leather, which develop a natural patina complementary to the steel case. For a sportier, nautical profile, vulcanised rubber or technical nylon NATO straps offer saltwater resistance and durability during diving. Avoid straps with aggressive decorative elements that conflict with the model's functional aesthetics.

Strap removal involves unscrewing the spring bar securing the lug to the case attachment, using a dedicated tool or small lever. Position yourself in bright light, gently push the spring bar inward to release the lug, and slide the strap out of the attachment. The operation requires no specialised tools and takes less than one minute.

Yes, any strap with a 21mm lug width is compatible with the L3.643.4.96.6. You can choose from our ready-to-ship straps or custom commissions through the Casati Milano atelier. Material quality and stitching craftsmanship determine investment longevity: we recommend vegetable-tanned leather or technical rubber over inexpensive synthetics.

A high-quality leather strap with vegetable tanning lasts 4–6 years of intensive daily wear, up to 8–10 years with moderate use. Longevity depends on UV exposure, saltwater humidity, and frequency of wear. Straps crafted at the Casati Milano atelier include an 18-month warranty and can be renewed through targeted stitching or buckle repairs.