Strap for PrimaLuna Automatic 30 Yellow Gold Diamond Leather MOP

The lug width of the Longines PrimaLuna L8.113.7.87.2 is 8 millimetres. This non-standard dimension responds to the specific proportions between the 30mm case and the wrist attachment. To verify it correctly, measure the internal distance between the two lug pins using a calliper positioned horizontally. Compatible straps must have a width of exactly 8mm to fit perfectly without play or constriction.

For the PrimaLuna L8.113.7.87.2 we recommend in order of priority: 1) alligator in cognac or hazelnut with natural finish, which enhances the warmth of yellow gold; 2) vegetable-tanned calf in tobacco or hazelnut tones, ages magnificently; 3) shell cordovan in mahogany, for those preferring characteristic texture and superior durability. Avoid synthetic NATO, which clashes with the case's nobility, and technical rubber, suitable only in summer. Stitching should be in natural beige thread; the deployante in gold-plated or satinised stainless steel.

Changing the strap on the PrimaLuna L8.113.7.87.2 requires a spring bar tool. Position the watch face-down on a soft surface. Locate the small hole on the outer part of each lug: insert the tool into the hole and gently press towards the case centre. This will release the lug pin outward. Once the old strap is removed, align the new one with the lug ends and reinsert the pin until it clicks into place. Verify that the lug is perfectly secure before wearing. If you are uncertain, the Casati Milano atelier offers this service by appointment.

Yes, you can use aftermarket straps that respect the 8mm lug width. The strap's quality should be considered an upgrade over the original: leathers such as alligator, shell cordovan or vegetable-tanned calf offer superior aesthetics and predictable ageing. Quality straps guarantee better tactile sensation, natural patina development over time and a more refined appearance. Always verify that the buckle is gold-plated or satinised stainless steel to maintain aesthetic coherence with the yellow gold case. Milano Straps offers a selection of pre-made and customisable 8mm straps, or you can commission a bespoke piece from the Casati Milano atelier.

The lifespan of a leather strap depends on usage and material. A quality alligator or shell cordovan with vegetable tanning lasts an average of 4–6 years with moderate daily use. Calf, being softer, may require replacement after 3–4 years. The natural patina that develops is part of the charm, not a defect. Factors extending durability: keep dry, avoid prolonged exposure to moisture and chlorine, alternate with other watches to reduce strap stress. Casati Milano straps, with vegetable tanning and natural thread stitching, include an 18-month manufacturer's guarantee and offer reconditioning services at reduced cost beyond the warranty period.