Armin Strom
Manual ST11-MW.05— lug 20mm

The Armin Strom Manual ST11-MW.05 features an integrated lug width of 20mm. This measurement represents the distance between the two inner lugs of the case where the strap attaches. It is essential to verify this dimension before ordering an aftermarket strap, as an incompatible lug width will not fit the case attachment mechanism. To measure accurately, remove the original strap and measure the distance between the inner edges of the two lugs using a digital calliper.

For this Swiss timepiece, we recommend first a black or dark brown alligator strap, which emphasizes the rational geometry of the case and dialogues beautifully with the transparency of the caliber. As a refined alternative, vegetable-tanned calf leather in cognac or black offers a patina that evolves over time and creates a personal bond with the watch. For a contemporary approach, a cotton canvas NATO or dark vulcanised rubber provides versatility and practicality. Your choice depends on primary use: formal occasions call for fine leather, active contexts accommodate technical materials.

The Armin Strom ST11-MW.05 employs a standard integrated lug system. To replace the strap, acquire a spring bar remover tool (inexpensive, readily available online). Insert the flat blade into the lateral hole of the lug, apply gentle downward pressure to compress the internal spring, and once released, extract the spring bar from its seat. Repeat on the opposite side. To reinstall the new strap, align the holes with the lugs and press until you hear an audible click. Do not force: the strap should slide naturally into position.

Yes, provided the lug width is precisely 20mm. Straps crafted by specialised ateliers are fully compatible and often qualitatively superior to the original strap, as they allow selection of fine leathers (alligator, shell cordovan, vegetable-tanned calf) and bespoke finishing. Always verify that the supplier specifies compatibility with 20mm lugs and that the strap is supplied with standard spring bars (16mm diameter). Beware of excessively cheap straps: construction quality is evident from solid stitching and material cohesion.

The longevity of a leather strap depends on material choice, usage pattern and maintenance. A well-maintained alligator or vegetable-tanned calf strap typically lasts 5–8 years with daily wear. Leather, being a natural material, wears primarily at flex points and where the buckle exerts pressure. Regular maintenance—occasional cleaning with a damp cloth and conditioning with specialist creams every 6–12 months—significantly extends strap life. The patina that develops over time, particularly on vegetable-tanned leather, represents an aesthetic advantage: each scuff and tonal shift narrates your watch's story.