Nomos Glashütte
Tangente 190— lug 18mm

The Nomos Glashütte Tangente 190 has a lug width of 18 millimetres. It is measured horizontally, from the lowest internal point of the spring pin on one side to the lowest internal point of the opposite screw hole. This measurement is critical for ensuring mechanical compatibility with any aftermarket strap.

For the Tangente 190, an alligator leather strap at 1.4 millimetres thickness represents the ideal choice, maintaining aesthetic coherence with the 35-millimetre satin-finished case. A valid alternative is vegetable-tanned calf leather, which develops a natural patina over time. For durable daily use, a grey or black NATO strap respects the Bauhaus austerity of the design.

The Tangente 190 employs a standard spring pin system without internal springs. To change the strap: 1) Place the watch case-down on a soft surface; 2) Use a spring bar tool to lever upwards and force the spring pin from below; 3) Once the pin is removed, gently extract the lug; 4) Insert the new strap and reinsert the spring pin, tightening moderately. Avoid forcing the mechanism to prevent damage to the case threads.

Yes, the Tangente 190 is fully compatible with aftermarket straps of 18-millimetre lug width. This standard is widely available, allowing you to experiment with different materials—alligator, cordovan, calf, NATO, rubber—without mechanical compromise. However, ensure the new strap has a maximum thickness of 1.5 millimetres to avoid friction against the case lugs.

Leather strap longevity depends on material quality and usage patterns. A high-quality alligator strap with vegetable tanning lasts approximately 3 to 5 years of daily wear before replacement is required. Vegetable-tanned calf leather has a similar lifespan (3–4 years). If exposed to constant moisture or perspiration, durability decreases to 2–3 years. The patina that develops naturally is part of the material's ageing, not degradation: in cordovan, this patina is considered desirable and valuable.