Strap for Tourbillon Skeleton Water

The lug width of the Armin Strom Skeleton ST15-TW.05 is 20mm. This measurement indicates the distance between the two lug holes on the case and determines strap compatibility. To measure correctly, position a tape measure between the holes without touching the case itself: the result must be exactly 20mm to ensure precise strap insertion.

For the ST15-TW.05, we recommend alligator leather in vegetable tanning or shell cordovan, which respect the structural purity of the skeletonised movement without competing visually. Vegetable-tanned calf offers subtle texture that amplifies aesthetic contrast. For sports use, a thick cotton NATO or FKM rubber maintains functional simplicity consistent with Armin Strom's philosophy.

The strap is changed using a dedicated tool (spring bar remover) to remove the spring bars from the case lugs. Insert the flat end of the tool into the small hole beneath the lug, applying gentle pressure until the spring releases. Extract the spring bar and repeat on the other side. To install the new strap, align the strap holes with the case holes, insert the spring bars, and verify they are fully seated.

Yes, you can use any strap with a 20mm lug width on this watch. Milano Straps' bespoke leather straps, crafted from materials such as alligator, calf, and shell cordovan in vegetable tanning, are fully compatible. Always verify that the width matches exactly 20mm to prevent lateral movement or forcing during insertion.

The lifespan of a leather strap depends on usage and maintenance. A vegetable-tanned quality leather, worn daily, has an average life of 3-4 years before requiring replacement. Vegetable tanning, unlike chrome tanning, develops a natural patina that increases its character over time. To extend lifespan, avoid wetting the strap, protect it from direct heat sources, and occasionally apply natural oils to nourish the leather.