Strap for PrimaLuna Automatic 26.5 Two Tone MOP

The lug width of the Longines PrimaLuna L8.111.5.87.6 is exactly 6mm. This rare measurement in contemporary watchmaking can be verified by removing the original strap and measuring the distance between the lug attachments with a digital calliper. It is essential to confirm compatibility before purchasing an aftermarket strap, as even 0.5mm tolerances would compromise the mechanical fit.

For the L8.111.5.87.6, we recommend natural brown alligator or vegetable-tanned calf to maintain consistency with the satin-finished case aesthetic. Alligator offers tactile lightness and controlled grain; calf develops patina over time. Alternatively, shell cordovan guarantees superior durability and marked lustre. The choice depends on intended use and personal maintenance preference.

To change the strap, use a spring bar remover tool (available from specialist retailers) to gently push the security pin that secures the strap to the lugs. Once the pin is removed, extract the old strap and insert the new one, aligning it perfectly with the lugs. Reinsert the spring bar until you hear a locking click. For the L8.111.5.87.6, once the 6mm compatible strap is installed, verify stability by pulling gently outward to confirm secure fastening.

Yes, Milano Straps offers 6mm-compatible straps for the Longines L8.111.5.87.6, selected in alligator, calf, shell cordovan and rubber. Each strap is verified to precise tolerances before despatch. Bespoke creations are also available through Casati Milano atelier, with personal leather selection, initials, customised stitching thread and 18-month warranty.

The lifespan of a leather strap depends on material and usage. Alligator in vegetable tanning generally maintains optimal performance for 3–5 years of regular use; shell cordovan for 4–6 years thanks to more resistant fibre structure. Vegetable-tanned calf may develop creasing over time if subjected to extreme bending, but acquires appreciable patina. To extend useful life, we recommend alternating straps with others, avoiding prolonged moisture exposure, and occasionally applying protective creams specific to vegetable leather.