Longines
Master Collection L2.357.4.99.6— lug 18mm

The lug width of the Longines Master Collection L2.357.4.99.6 is precisely 18mm. This measurement is taken from the inner space between the two lugs (the lateral pins of the case). To verify the measurement, position a ruler perpendicular to the lugs and measure the distance between the inner edges: the result must be exactly 18.00mm.

For the 34mm Master Collection in stainless steel, the ideal strap is premium alligator leather in dark brown tones (cognac, chestnut brown) with fine and consistent grain pattern. Alternatively, vegetable-tanned calf leather in black or slate grey develops a beautiful natural patina over time. Both materials should be paired with a stainless steel deployante clasp to ensure secure and elegant fitment.

Strap replacement is a simple operation requiring a basic tool: a pin remover (strap removal tool). Steps: 1) position the watch with the strap facing downward, 2) insert the pin remover into the hole of the lower lug, 3) push gently to extract the pin, 4) repeat from the opposite side, 5) remove the old strap, 6) insert the new strap and reinsert the pins from both sides. The operation takes approximately 2 minutes and requires no specialized skills.

Yes, any strap with an 18mm lug width is compatible with the L2.357.4.99.6, regardless of manufacturer. It is important to verify that the strap is constructed from quality materials (natural leather or technical rubber) and that the fixing pins are robust stainless steel. Custom artisanal straps allow you to choose thickness, length, clasp type, and stitching colour according to personal preference.

A quality leather strap (vegetable-tanned alligator, full-grain calf) has an average lifespan of 3–5 years under normal usage conditions, assuming moderate daily use. Longevity depends on: ambient humidity, frequency of use, sun exposure, type of tanning, leather thickness, and personal care. A strap subjected to regular maintenance (conditioning with natural wax, air drying after moisture exposure) can last up to 7 years. After this period, the leather naturally begins to crack; strap replacement is the ideal moment to experiment with a new material or colour.