Strap for Skeleton Pure Earth

The lug width of the ST15-PE.40 is 20 millimetres. This width is measured between the two suspension pins of the case and is the standard for medium to large diameter watches such as this 43.40mm model. Precise measurement is critical to ensure correct ergonomic and aesthetic fit of the strap.

Alligator leather of high quality represents the conservative luxury choice for this model, as its sober tonality and fine grain do not compete with the visibility of the skeletonised movement. Vegetable-tanned calf offers a contemporary alternative with evolving patina over time. Shell cordovan introduces refinement through its distinctive grain. The choice depends on the desired balance between constructive minimalism and tactile character of the strap.

Strap replacement requires the aid of a spring bar removal tool to precisely extract the two suspension pins from the case lugs. For the ST15-PE.40, with its integrated stainless steel lugs, it is advisable to work with care to avoid scratches on the case. If you lack experience, it is preferable to contact a specialised atelier such as Casati Milano to ensure correct execution.

Yes, any strap with a 20 millimetre lug width is compatible with the ST15-PE.40. Compatibility is determined solely by strap width and not by watch brand. Milano Straps offers a complete collection of artisanal 20mm straps in various materials (alligator, calf, shell cordovan, NATO, rubber), selected to dialogue aesthetically with watches in this category.

The lifespan of a leather strap depends on the material and frequency of wear. Alligator and shell cordovan, if subjected to traditional vegetable tanning, have a lifespan of 3 to 5 years with daily wear, with a patina that improves over time. Vegetable-tanned calf typically lasts 2 to 4 years. These timeframes are considered normal as leather is a living material that ages naturally. Milano Straps offers regeneration and replacement services to extend the useful life of the strap.