Strap for Conquest Classic Automatic 29.5 Stainless Steel / Red Gold / Diamond / Black / Strap

The lug width of the Longines Conquest Classic L2.285.5.57.3 is 20mm. This measurement represents the internal space between the two lugs of the case and determines compatibility with any aftermarket strap. To verify the measurement, use a digital calliper positioned parallel to the dial on the inner face of the upper lug.

The Conquest Classic L2.285.5.57.3, with its bi-metal case in rose gold and stainless steel, pairs beautifully with alligator or shell cordovan in warm tones (cognac, bordeaux). For a contemporary approach, calf leather with vegetable tanning or a grey-blue NATO canvas guarantee versatility. The key is maintaining moderate colour contrast that does not overwhelm the delicate 30mm case.

To change the strap, you will need a specialised tool called a spring bar tool. Insert the small end of the tool into the access hole at the end of the lug, press gently to compress the internal spring mechanism of the spring bar, and once compressed, extract the bar outward. Next, insert the new strap into the same lug by positioning the spring bar in the hole and releasing pressure so it anchors securely. The operation requires delicacy to avoid scratching the case.

Yes, any strap manufactured to the 20mm standard is compatible with the Conquest Classic L2.285.5.57.3. However, it is essential to verify that the strap has been produced to precise tolerances (±0.2mm is acceptable). Quality artisanal straps, such as those offered on MilanoStraps and created at the Casati Milano atelier, guarantee precise insertion without play or binding. Before purchase, it is advisable to confirm that the seller explicitly specifies compatibility with this lug width.

The lifespan of a leather strap depends on the material and usage. A quality alligator or shell cordovan, with proper care, guarantees 5–7 years of daily wear before requiring replacement for aesthetic maintenance. A vegetable-tanned calf, softer and more porous, tends to patina more rapidly (2–4 years of intensive wear) but can develop a fascinating patina. Rubber (caoutchouc) on a canvas base offers the greatest longevity (7–10 years), especially if not exposed to direct heat sources. The Casati Milano atelier guarantees 18 months for bespoke straps created with artisanal finishes, regardless of leather type.