Strap for Tetra Duo Lily

The lug width of the Nomos Glashütte Tetra 405.S3 is 17 millimetres. This measurement represents the internal distance between the two horizontal lugs on the stainless steel case. To verify strap compatibility, measure internally between the lugs: the result must be exactly 17mm. This precision is essential to ensure a secure fit without movement and uniform wear over time.

The ideal strap depends upon your lifestyle and intended usage. For formal elegance, we recommend alligator leather with vegetable tanning in dark brown or grey-green tones, which complements the white dial and satin-finished steel perfectly. For daily versatility, a naturally aged calf leather offers aesthetic authenticity and develops a unique patina over time. For those seeking practicality and rapid seasonal changes, a high-quality cotton NATO strap in neutral tones is the most functional choice. The 405.S3 paired with a stainless steel deployant clasp ensures maximum comfort.

Changing the strap on the Tetra 405.S3 requires a spring bar tool and gentle handling. Position the watch on a soft surface with the case facing upward. Insert the spring bar tool into the small hole beside one of the horizontal lugs, applying gentle pressure to compress the internal spring. Extract the pin by pulling towards you, then repeat for the second pin. Install the new strap by reversing the procedure. If uncertain, consult a professional watchmaker or visit our Casati Milano atelier by appointment.

Any strap with a 17mm lug width is compatible with the Tetra 405.S3. Milano Straps offers a curated selection of straps in alligator leather, natural calf, cordura NATO, and vulcanised rubber, all crafted according to Italian artisanal standards. Our straps are pre-fitted for immediate use with 17mm cases. We recommend straps with thickness between 3.5mm and 4.5mm to maintain the proportionate elegance of the Tetra.

The longevity of a leather strap depends upon multiple factors: tanning quality, frequency of use, exposure to moisture and temperature variations. A high-quality artisanal alligator or naturally aged calf strap with vegetable tanning maintains structural and aesthetic integrity for 5–8 years with daily wear, extendable to 10–12 years with conscious maintenance (rotation with other straps, periodic cleaning, protection from excessive perspiration). A high-quality cotton NATO strap has a slightly shorter lifespan of 3–5 years but remains the most resilient against external agents. Investing in multiple straps and rotating them seasonally significantly extends the average life of each.