Strap for Master Collection Power Reserve

The lug width of the Longines Master Collection L2.666.6.78.6 is precisely 20mm. This measurement is the standard for elegant watches in this category and should be measured accurately using a digital calliper between the two lateral lugs of the case. Correct lug width ensures perfect strap deployment and visual balance of the timepiece.

For the Longines Master Collection in yellow gold, authentic alligator leather in caramel or dark brown tones is the most refined choice, as it enhances the visual richness of the case. Shell cordovan in burgundy tones represents an elegant alternative with a natural patina that evolves over time. Vegetable-tanned calf leather in tobacco brown or black offers daily versatility whilst maintaining the nobility of the timepiece.

To change the strap on the L2.666.6.78.6, use a spring bar tool to gently extract the two metal pins connecting the original strap to the case. Once removed, slide the new 20mm strap under the pins, ensuring the lug openings are perfectly aligned. Reinsert the pins with a fluid motion until they click into place. We recommend performing this operation with care to avoid scratching the yellow gold case.

Yes, any strap with a 20mm lug width is compatible with the Longines Master Collection L2.666.6.78.6. Quality aftermarket straps in alligator, shell cordovan, calf leather, NATO and natural rubber fit perfectly onto the original pins without modification. The key is to verify that the lug width is exactly 20mm to ensure correct deployment and prevent abnormal wear.

The lifespan of a natural leather strap depends on usage, care and material quality. An alligator or shell cordovan strap of good quality, used regularly, has an average lifespan of 3-5 years before replacement is needed. If rotated frequently with other straps, longevity increases significantly. Vegetable-tanned leather visibly ages but remains functional longer due to its greater robustness. Regular maintenance with gentle cleaners and storage in dry environments significantly extends the strap's useful life.