Strap for PrimaLuna Quartz 23 Two Tone

The lug width of the Longines PrimaLuna L8.109.5.91.6 is exactly 6mm. This microscopic dimension is a direct consequence of the 23mm case and requires precise measurement with a digital calliper perpendicular to the lug pins. Any strap for this model must have a nominal width of 6mm to ensure functional compatibility and aesthetic balance of the case.

Alligator leather dyed in neutral tones (black, dark brown, navy blue) is the most versatile choice, thanks to its regular scale texture that does not compete visually with the case. Vegetable-tanned calf leather offers noble ageing patina and soft tactile sensation. Shell cordovan guarantees natural brilliance and superior durability. The choice depends on context: rubber straps with textured finish are ideal for summer, whilst natural leathers suit the rest of the year.

Remove the old strap by gently extracting the pins from the lugs using a dedicated pin remover tool. Insert the new strap's pins one side at a time, ensuring they are aligned perpendicularly to the lug. Verify the strap is firmly secured by gently pulling and checking it does not rotate. If the strap features a spring bar, pass the attachment wire through the central lug connection. The 6mm lug width requires care and appropriate tools.

Any strap with a 6mm lug width is compatible with the Longines L8.109.5.91.6, regardless of brand. It is essential to verify measurements precisely: 6mm width and appropriate length for the wrist (approximately 70mm for short strap and 120mm for long strap as standard). Specialist watch strap providers such as Milano Straps offer options in alligator, calf, cordovan and rubber, all customisable in length and finishes.

The lifespan of a leather strap depends on the material and treatment. A quality alligator or vegetable-tanned calf strap typically lasts 3-5 years in daily use. Shell cordovan can last 7-10 years thanks to its superior density. Durability is influenced by sun exposure, humidity, perspiration and frequency of use. Natural ageing with visible patina is a sign of longevity, not deterioration. The 18-month warranty offered by Casati Milano covers manufacturing defects.