Strap for Ahoi Neomatik 38 Sand / Closed Case Back

The Nomos Glashütte Ahoi 517 features a lug width of 20 millimetres. This measurement represents the distance between the two lugs of the case and is essential for selecting compatible straps. To verify the measurement, position a digital calliper between the lugs: the value must be precisely 20mm. Any strap purchased must respect this specification, otherwise it will either fail to insert correctly or create unwanted play.

The Ahoi 517 lends itself to various material interpretations. For aesthetic affinity with Bauhaus design and manufacturing quality, an alligator strap with vegetable tanning offers formal elegance and natural texture. For those preferring an evolving aesthetic over time, shell cordovan with vegetable tanning guarantees luminosity and deep patina. For a sporty-casual approach, NATO straps in cotton or linen provide practicality. Quality rubber (FKM) represents the most versatile and contemporary choice. We recommend selecting based on the predominant use of the watch and your desired wearing context.

Changing the strap on the 517 requires the use of a spring bar tool or equivalent implement. Position the watch on a stable surface, insert the tool's tip under the spring of the connection bar between lug and strap, and apply gentle upward pressure to release the spring. Once the spring is freed from one side, extract the bar. Repeat the process from the opposite side. Insert the new strap of the correct width (20mm), reinsert the spring bar, and verify positioning. If you are inexperienced, we recommend consulting a professional watchmaker to avoid damage.

Yes, it is possible to use quality aftermarket straps provided they rigorously respect the 20-millimetre lug width specification. A well-executed aftermarket strap—crafted in fine leather with vegetable tanning, FKM rubber, or technical textiles—will not compromise the watch's value if chosen with aesthetic and constructive awareness. However, we recommend avoiding generic, synthetic, or low-quality straps, which would betray the manufacturing solidity of the timepiece. Consult specialist strap providers who understand correct assembly protocols and offer verified materials.

The lifespan of a leather strap depends on the type of tanning and frequency of wear. A quality artisanal alligator strap with vegetable tanning, worn daily, can last between 4 and 7 years before showing significant signs of wear. Shell cordovan with vegetable tanning, thanks to the superior density of the leather, may last 8-10 years. A lower-quality calf strap shows wear within 2-3 years. To extend longevity, we recommend rotating wear with other straps (allowing the leather to dry completely between wears), protecting from prolonged moisture, and avoiding direct contact with acidic perspiration. Proper maintenance—periodic cleaning and, if necessary, gentle hydrophobic treatment—keeps the strap in optimal condition over time.