Strap for PrimaLuna Quartz 26.5 Stainless Steel / Blue MOP - Diamond / Bracelet

The lug width of the Longines PrimaLuna L8.120.4.98.6 is exactly 6mm, a very specific and non-standardized measurement. To verify this correctly, position a calliper between the two lug attachments on the case, excluding any lateral protrusions of the movement cage. This dimension requires custom or bespoke straps, as the majority of commercially available straps range between 8mm and 20mm.

The ideal material depends on intended use and aesthetic preferences. Alligator leather with vegetable tanning represents the highest quality option, developing an extraordinary patina over time. For minimalist elegance, smooth calf leather dialogues perfectly with the case. Shell cordovan is recommended for those who appreciate exceptional ageing characteristics. For demanding daily use, a structured NATO fabric or rubber strap maintains the correct proportions of the 26.50mm case while offering practicality.

Strap removal is accomplished by extracting the spring bars that connect the strap to the case lugs. Use a dedicated spring bar tool to insert the tip into the bar aperture, lift gently, and slide the bar outward. Repeat for both sides. Insert the new 6mm strap, ensuring the spring bar is fully seated in position. For timepieces of significant value, strap changes performed by a professional watchmaker are advisable.

Yes, it is possible to use aftermarket straps provided the lug width is exactly 6mm. Always verify lug width measurements before ordering. Artisanal straps in alligator, calf, and vegetable-tanned leather offer superior quality compared to mass-produced alternatives and maintain the aesthetic integrity of the model. Using incompatible straps risks damaging the case lugs.

Leather strap longevity depends on tanning quality, material type, and usage patterns. Vegetable-tanned alligator leather typically lasts 3–5 years with regular daily wear. Vegetable-tanned calf has comparable durability. Shell cordovan can last 5–7 years due to its exceptional fibre structure. Factors such as perspiration, sun exposure, and humidity affect ageing. Periodic maintenance—gentle cleaning and leather conditioning—significantly extends strap lifespan.