Strap for PrimaLuna 34 Automatic Moonphase Stainless Steel / MOP / Bracelet

The Longines PrimaLuna L8.126.4.87.6 is fitted with lugs measuring 8 millimetres in width. This dimension is standard for the model and determines compatibility with aftermarket straps. To verify the measurement, use a digital calliper, measuring the internal space between the two lugs perpendicular to the dial.

Given the proportions and aesthetic of the PrimaLuna, an alligator strap with vegetable tanning is the most coherent choice. Alligator provides the structural rigidity necessary for slender 8mm lugs and develops a natural patina that harmonises with the watch's minimalist character. Elegant alternatives include quality calf leather (Annecy, English) or FKM rubber for greater daily practicality.

To change the strap, proceed as follows: position the watch on a soft surface with the case back facing up. Use a spring bar tool to push downward on the lug spring, releasing the pin. Repeat for the other side. Insert the new strap by aligning the holes with the bars, then push until you hear the click of closure. Verify that both lugs are properly secured before wearing the watch.

Yes, all straps with an 8-millimetre lug width are compatible with the PrimaLuna L8.126.4.87.6. However, it is essential to purchase straps constructed with precision: 8mm lugs require strict millimetric tolerances. Poor-quality straps may develop mechanical play or premature deterioration of stitching. We recommend artisanal or semi-artisanal straps, manufactured by leather workshops specialising in horology.

The lifespan of a leather strap depends on the quality of tanning, the material and daily wear. An alligator strap with vegetable tanning, worn moderately 5–6 days per week, maintains structural integrity for 3–5 years. Quality calf leather lasts 2–4 years. Rotating between multiple straps extends the longevity of each. Casati Milano guarantees its artisanal straps for 18 months from purchase, although natural leather deterioration is considered ordinary wear.