Strap for Admiral Chronograph GMT

The lug width of the Longines Admiral L3.670.4.56.6 is 21mm. This measurement is crucial when selecting an aftermarket strap, requiring millimetre precision in shaping the lug ends to ensure a smooth transition between case and strap, without lateral play.

For the Admiral L3.670.4.56.6, we recommend an alligator strap (Mississippi or Nile grain), whose regular grain pattern and natural patina create aesthetic coherence with the dial's sober geometry. Alternatively, vegetable-tanned calf develops a rich patina over time, whilst FKM rubber remains ideal for intensive daily wear.

The strap is changed using a dedicated tool (spring bar tool) or precision punch: keep the watch secure, locate the spring bar beneath the lug, compress its spring slightly, and slide out the old strap end. Insert the new strap, ensuring the bar clicks fully into both positions.

All straps with a 21mm lug width are compatible with the Admiral L3.670.4.56.6. At milanostraps.it, the complete collection of 21mm straps in alligator, calf, shell cordovan and rubber is available, customisable in length, initials and stitching thread, with an 18-month warranty.

A quality leather strap (alligator, calf, shell cordovan) maintains structural performance for 3-5 years of regular wear, developing a rich patina over time. Lifespan depends on intensity of use, climatic conditions (humidity compromises integrity) and maintenance. Casati Milano artisanal straps guarantee 18 months and support for preventive extensions.