Strap for PrimaLuna 30.5 Quartz Moonphase Stainless Steel / Green - Roman / Bracelet

The lug width of the Longines PrimaLuna L8.115.4.61.6 is 8mm. This dimension is determined by the width of the lug hole in the case middle. To verify it, position a digital calipre in the lug passage and measure from wall to wall on the inside: the result must be exactly 8.00mm. Purchasing a strap with this specific measurement ensures precise fitment without excessive play.

The choice depends on intended use and aesthetic preferences. A satin-finished alligator with fine grain creates formal contrast with the stainless steel case, ideal for business occasions. Italian calf leather in vegetable tanning offers authenticity and develops natural patina over time. An FKM rubber strap ensures durability and practicality for daily wear. We recommend straps with 8mm lug width and 2.5-3mm thickness to maintain the original aesthetic profile.

The Longines PrimaLuna features fixed lugs (non-deployant). To replace the strap, remove the spring bars that traverse the lug hole from one side to the other: use a dedicated lever tool to compress the internal spring and slide the bar out. Next, position the new 8mm strap through the case lugs, reposition the spring bar in the lug hole and allow the spring to snap back. Verify that the spring bar is securely seated before wearing the watch.

Yes, provided the strap has exactly 8mm lug width and is manufactured from quality materials (leather, rubber, or textile). Straps fabricated with irregular undercutting or non-uniform thickness may create friction in the lug passages, damaging the case finish over time. We recommend straps from specialist ateliers that guarantee precise manufacturing tolerances. Milano Straps provides bespoke straps with certified quality and verified compatibility.

The durability of a leather strap varies based on material and frequency of wear. High-quality alligator, worn daily with regular rotation, typically lasts 5-7 years before replacement becomes necessary. Vegetable-tanned calf, exposed to natural light, develops a protective patina that extends durability to 4-6 years whilst maintaining pleasant aesthetics. FKM rubber resists degradation beyond 8 years. Maintenance recommendations: store the watch in a dry location, avoid prolonged direct sunlight exposure, apply protective balm to leather every 6-12 months.