Strap for Hydroconquest GMT 43 Stainless Steel / Black / Rubber

The Longines HydroConquest L3.890.4.56.9 features a lug width of 22mm. This measurement refers to the distance between the lugs (spring bar holders) of the case and is essential for selecting compatible straps and bracelets. It is important to measure it accurately using a calliper on the inner shoulders of the lugs, excluding the crown.

This depends on usage and personal preference. For elegant daily wear, we recommend alligator in vegetable tanning (which develops patina over time) or high-quality regenerated calf leather. For serious diving use, polyurethane rubber maintains flexibility and naturally drains water. Premium NATO straps in regenerated yarn offer sporty versatility with a sustainable approach. MilanoStraps provides straps precisely dimensioned for the 22mm lug width.

The original strap is typically secured via spring bars inserted into the case lugs. To remove it, use a dedicated tool (spring bar tool) to release the elastic pins that support the bars, gently pushing inward. Extract the old strap and insert the new one, aligning the bars with the case lugs. Ensure the elastic pins are correctly positioned. We recommend consulting professionals if unfamiliar with this procedure.

Yes, compatible aftermarket straps are an excellent option for personalising your timepiece. MilanoStraps provides 22mm straps crafted from quality materials (alligator, calf, premium NATO) specifically dimensioned for this lug width. The key is to verify that the width is exactly 22mm and that the spring bars are compatible with your case lugs. Atelier Casati Milano also offers bespoke solutions with 18-month warranty.

The lifespan of a leather strap depends on frequency of wear, moisture exposure, and tanning method. With daily use and moderate water exposure, a quality alligator or calf strap typically lasts 3-5 years before requiring replacement. Vegetable-tanned leather develops a fascinating patina over time, becoming increasingly personal. Constant moisture exposure (frequent diving) reduces durability: in such cases, polyurethane rubber or NATO are more appropriate choices. MilanoStraps offers specific warranties on each material.