Strap for PrimaLuna 30.5 Quartz Moonphase Stainless Stee - Yellow Gold / Gilt - Roman / Bracelet

The lug width of the Longines PrimaLuna L8.115.5.31.7 is 8 millimetres. This measurement is determined by the internal distance between the two case lugs where the strap attaches. For the PrimaLuna, respecting this dimension is critical: straps narrower than 8mm will be unstable, whilst wider straps will not fit into the lug slots. Measurement is performed using a digital calliper positioned between the inner edges of the case terminals.

The ideal strap for the Longines PrimaLuna L8.115.5.31.7 is natural alligator leather in cognac, dark brown or black tones. Alligator offers fine and consistent grain, develops natural patina over time, and maintains perfect aesthetic proportion with the 30.5mm case diameter. Alternatively, shell cordovan (equine leather) delivers introspective character and multi-year durability. For a contemporary choice, vegetable-tanned calf leather maintains heritage coherence with the PrimaLuna collection.

To change the strap on the Longines PrimaLuna L8.115.5.31.7, use a dedicated spring bar removal tool. Position the watch so the case lugs are accessible, insert the tool into the micro-hole on the side of the spring bar to release the mechanism, then carefully extract the bar. Once the previous strap is removed, align the new 8mm strap with the lug holes, reposition the spring bar to its seat, and verify secure engagement. We recommend this procedure be performed at an authorised Longines service centre or at Atelier Casati Milano to ensure precision and case protection.

Yes, the Longines PrimaLuna L8.115.5.31.7 accepts quality aftermarket straps provided the lug width is precisely 8 millimetres. Artisanal straps from Milano Straps, crafted in alligator, shell cordovan, vegetable-tanned calf and other noble materials, are fully compatible. Always verify lug width prior to purchase and consult technical data provided by the manufacturer. Premium aftermarket straps often deliver superior longevity and customisation versus OEM options.

Leather strap lifespan depends on material choice and usage intensity. Natural alligator and shell cordovan typically deliver 5–8 years of daily wear before replacement, developing natural patina and chromatic variation. Vegetable-tanned calf offers 3–5 years of intensive use. Longevity is influenced by sun exposure, humidity, frequency of wear, and proper maintenance (prompt drying after moisture, avoidance of excessively humid environments). Atelier Casati Milano provides 18-month warranty on bespoke straps and offers restoration and regeneration services to extend strap lifespan.