Strap for La Grande Classique 37 Quartz Diamond Bezel MOP

The lug width of this model is exactly 20 millimetres. This specific measurement is critical when purchasing a compatible strap: do not confuse it with adjacent sizes such as 19mm or 21mm, as they would cause aesthetic misalignment between the case and strap. To verify, measure the internal space between the two metal lugs using a digital calliper or flexible ruler.

Alligator is the natural choice: its regular grain imparts a formal order coherent with the watch's understated design. However, vegetable-tanned calf offers greater versatility and more compelling ageing patina. For daily use, cordovan presents initial stiffness that improves with wear. NATO textile straps in neutral tones permit casual wear without concerns of deterioration.

The Longines La Grande Classique L4.770.0.80.6 features fixed spring bars. To remove the old strap, use a spring bar remover tool (a small forked screwdriver) to press inward gently on one side of the spring, sliding the bar free. Repeat for the second side. To install the new 20mm strap, align the lug holes with the bars and press until you hear the locking click.

Yes, provided they rigorously respect the 20mm lug width. Bespoke aftermarket straps (in alligator, calf, or cordovan) are compatible with the original Longines lugs. However, we recommend verifying that the strap body width at the shoulders does not exceed 22-23mm for correct aesthetics, and that buckle passant finishes are in brushed steel to harmonise with the case.

Longevity depends on material and wear patterns. Quality alligator lasts 3-5 years in daily use. Vegetable-tanned calf evolves aesthetically after 1-2 years but remains functional for 4-6 years. Cordovan, initially stiffer, can reach 5-7 years. Determining factors are: mechanical wear on the buckle, sun exposure, humidity, and cleaning frequency. A strap preserved in a dual-watch rotation (weekly alternation) lasts at least 50% longer.