Nomos Glashütte
Club 738.S5— lug 20mm

The Nomos Glashütte Club 738.S5 is equipped with a 20mm lug width. This dimension is measured by placing a digital calliper perpendicular to the case lugs, between the two lateral pins. Nomos's choice of 20mm reflects their design philosophy: it maintains the watch's lightweight profile (approximately 65 grams), preserves the golden proportions of the dial, and ensures compatibility with a broad range of certified aftermarket straps. It is a standard that enables personalisation without compromising wearability.

The optimal choice depends on your intended use and aesthetic preferences. An alligator leather dyed through vegetable tanning, with pronounced grain, amplifies the watch's understated elegance and develops authentic patina over time. A calf leather tanned through vegetable tanning offers superior durability and acquires tactile memory with daily wear. For versatility, a cotton NATO strap allows rapid changes and proven robustness. A FKM rubber strap preserves the internal movement in humid environments without visual compromise. The steel case dialogues harmoniously with all these materials due to its neutral geometry.

Changing the strap on the Club 738.S5 is a straightforward procedure. Position the watch on a soft surface (microfibre cloth) with the dial facing downward. Locate the two lateral pins that secure the strap to the case. Using a spring bar tool, apply gentle downward pressure on one of the pins to release the internal spring, then remove the old strap. Insert the new strap with a 20mm lug width, aligning it with the pins, then press until you hear a click confirming closure. This process requires no horological expertise and takes less than three minutes.

Yes, absolutely. The 738.S5 is fitted with a 20mm lug width, a widely-established standard. Any strap certified for this dimension integrates flawlessly without forced adaptation. The case's linear design and the Club's proportions harmonise beautifully with diverse materials—leather, fabric, rubber—whilst preserving the aesthetic balance of the original design. We recommend selecting materials of superior quality (leather tanned through vegetable methods, FKM rubber, cotton or silk textiles) to achieve constructive coherence with the internal workings of the Alpha calibre.

Durability depends on the tanning method and intensity of wear. A calf leather strap tanned through vegetable methods, worn daily, maintains structural integrity for 3 to 5 years before replacement becomes necessary; however, it continues to acquire character—patina—throughout its life. A high-quality alligator leather strap resists deterioration for 5 to 7 years. Leather is a living material: exposure to perspiration, water, and sunlight accelerates the oxidation cycle, conferring a unique memory to the strap. Vegetable-tanned leather is particularly reactive, developing golden and violet hues with time. We recommend rotating leather straps to distribute wear evenly and permit the leather to breathe between changes.