Strap for PrimaLuna Automatic 26.5 Yellow Gold

The lug width of the Longines PrimaLuna L8.111.6.78.6 is 6mm. This dimension is determined by the distance between the vertical lugs of the case and represents Longines' construction standard for this model. To verify strap compatibility, measure the space between the lugs using a digital calliper, ensuring the strap enters without force.

The strap most aligned with the character of the PrimaLuna L8.111.6.78.6 is vegetable-tanned alligator, which amplifies the personality of the yellow gold case through natural texture and patina development over time. Valid alternatives include vegetable-tanned calf for daily wear, shell cordovan for rarity and solidity, and nautical textile for contemporary contrast.

To change the strap, obtain a spring bar remover tool or consult a watchmaker. Position the watch face down, locate the vertical pin that supports the lug, and press gently to release the spring. Remove the old strap and insert the new one by aligning the holes and pressing until the spring clicks into place. Repeat for the other side.

Yes, any strap with a 6mm lug width is mechanically compatible with the PrimaLuna L8.111.6.78.6. The lug width is the only binding parameter. However, to maximise aesthetic harmony, we recommend artisanal straps that respect the classical proportions of the case—avoid excessive widths that would visually unbalance the model.

The lifespan of a leather strap depends on the material, tanning method and usage. Vegetable-tanned alligator can last 4–6 years if cared for, while vegetable-tanned calf lasts 2–4 years. Shell cordovan is the most durable, exceeding 10 years with progressive patina. Exposure to sun, moisture and perspiration accelerates ageing. Casati Milano straps include an 18-month warranty.