Strap for Club Spiort Neomatik Worldtimer Volcano

The Nomos Glashütte Club 790.S1 is equipped with a 20mm lug width. This specific measurement was chosen by Glashütte to maintain optimal proportions relative to the 40mm case, avoiding an excessively bulky aesthetic. To verify strap compatibility, ensure that the spring bar inserts into the lug slot without forcing: a clearance of a few tenths of a millimetre is normal, but maximum tolerance should not exceed 0.5mm.

Your choice of material depends on intended use. For formal daily wear, a strap in alligator or calf leather with vegetable tanning is optimal: the natural grain of the leather evolves over time, developing a patina that complements the satin-finished steel case. For demanding professional environments or warm climates, a NATO in polyamide ensures practicality without compromising legibility. FKM rubber offers maximum comfort in sporting contexts. Casati Milano personalises every strap to the specific geometry of your wrist.

Changing the 790.S1 strap involves removing the two lateral spring bars: both slide horizontally. Use a dedicated tool, such as a spring bar removal tool or watchmaker's specific implement, to gently compress the spring of the bar until it exits the lug slot. This process requires care to avoid scratching the case. Once the bars are freed, the old strap separates easily. Insert the new 20mm strap by aligning the holes with the spring bars, then verify that closure is secure by pushing the bar downward until it clicks into place. If you lack the specific tools, a professional watchmaker can perform this operation in minutes.

Yes. MilanoStraps offers a comprehensive selection of aftermarket straps certified at 20mm, constructed to sartorial precision standards. Available options include: alligator with vegetable tanning, calf leather with satin finishes, polyamide NATO, and FKM rubber. Each strap undergoes quality control to ensure perfect insertion of spring bars without play or forcing. Online personalisation allows you to select colour, deployant clasp finish, and passant type (satin or polished steel). For bespoke consultations, Casati Milano offers atelier appointments where you can directly evaluate chromatic matching and comfort.

The durability of a vegetable-tanned leather strap depends on frequency of use and maintenance. Under normal conditions (worn five days weekly), an artisanal-quality strap resists 3–5 years before showing significant wear at the lugs or clasp. Patina and leather ageing are natural and desirable: they testify to material authenticity. To extend lifespan, keep the strap dry (avoid prolonged immersion), avoid direct heat exposure, and periodically apply hydrating treatment specific to vegetable-tanned leather. A polyamide NATO typically lasts 2–3 years before showing visible wear on passants, though it is easily replaceable. FKM rubber maintains elastic properties for 4–5 years, after which it tends to stiffen.