Strap for Avigation Chronograph Stainless Steel / Portugal

The lug width of the Longines Heritage L2.668.4.21.2 (also known as L26684212) is 20mm. This dimension represents the physical space between the case lugs where the strap must be inserted. To verify it, measure directly the width of the space between the suspension tubes of the case at the lug position; the value must be exactly 20mm to guarantee full compatibility with aftermarket straps.

For an instrument of this stylistic architecture, alligator remains the supreme choice: the natural grain dialogues directly with the satin finish of the stainless steel case. Leather worked with vegetable tanning represents an alternative of lower tactile complexity yet still elegant, capable of developing authentic patina over time. Shell cordovan, with its exceptional density and progressive interior lustre, is the solution for the aesthete. For more contemporary contexts, an FKM rubber with hammered texture offers interesting contrast while maintaining stylistic coherence.

The Longines Heritage L2.668.4.21.2 is equipped with standard 20mm lugs without proprietary systems. To change the strap, you must remove the spring bars from the lugs using a dedicated tool: a spring bar tool with lateral pressure mechanism. Compress the internal spring of the pin on one side, insert the new strap on the other side, then release the pressure to secure the pin. This operation requires precision to avoid damage to the case finishes.

Yes, any strap marked 20mm is compatible with the Longines Heritage L2.668.4.21.2, provided that the strap shoulders (the section resting on the case) respect standard dimensions. Quality aftermarket straps maintain identical construction tolerances to originals. Verify that the total length of the strap is sufficient for your wrist (combination of upper and lower rings): Casati Milano offers custom sizing in this regard.

Longevity depends on the type of leather and frequency of use. An alligator or shell cordovan strap, on a daily-wear watch, typically lasts 5-7 years before wear signs require professional maintenance. Vegetable-tanned leather tends to last 3-5 years under normal conditions. The patina that develops is not a sign of deterioration, but of controlled aesthetic ageing. Casati Milano offers an 18-month warranty on its work and permanent support for maintenance and leather regeneration.