Strap for Spirit 31 Quartz

The lug width of the Longines Spirit L2.198.4.23.2 is 15 millimetres. This measurement is specific to the 31mm case and determines compatibility with aftermarket straps. To verify the correct measurement, use a digital caliper positioned perpendicularly at the spring bar attachment point.

The best strap depends on intended use and aesthetic preference. Vegetable-tanned alligator offers lasting elegance and develops a fascinating patina over time; thick calf leather provides softness and dramatic patina development; a grey military-canvas NATO strap echoes the collection's aeronautical heritage; structured rubber is ideal for humid environments. All materials should be paired with a quality tempered-steel spring bar.

Strap replacement requires a spring bar tool. Position the flat end of the tool under the spring bar, apply gentle upward pressure until the bar springs free, then remove the worn strap. Align the new strap with the lug shoulders and carefully slide the spring bar into both attachment holes. Verify that the spring bar is fully seated on both sides.

Any strap with a 15mm lug width is compatible with the L2.198.4.23.2, provided the spring bar is of quality (tempered steel) and the strap terminals are correctly profiled. It is important to select thicknesses consistent with the lugs: an excessively thick strap may cause friction during wear; one too thin will be unstable. Specialist suppliers such as Milano Straps guarantee correct dimensional compatibility.

A quality leather strap (alligator, calf or shell cordovan in vegetable tanning) can last from 3 to 7 years in daily use, depending on frequency of wear, humidity exposure and maintenance. Natural leather gradually wears at the buckle attachment point, ageing gracefully and developing patina. To extend lifespan, we recommend rotating straps and avoiding direct heat exposure. Annual treatment with natural wax preserves the fibrous structure intact.