Strap for Orion 38 Silver / Closed Case Back

The lug width of the Nomos Glashütte Orion 378 is 19 millimetres. This measurement is crucial for the visual proportion of the case to the wrist and requires straps specifically manufactured for this width. Measuring the lug width involves inserting calliper into the opening between the lug pins, excluding the lugs themselves.

For the 378, the ideal strap depends on intended use. Dark brown or deep black alligator represents the formal choice, emphasising the austere character of the white dial. Vegetable-tanned calf leather offers a rawer aesthetic with visible ageing, whilst NATO straps in cream or navy blue provide sporty versatility. Anthracite or black FKM rubber remains the practical option, ideal for daily wear contexts.

To change the strap, you must remove the spring bars (small metal pins) that connect the lugs to the case. Using a dedicated spring bar tool, press the pin to release tension and withdraw the old strap. The new 19mm strap is threaded through the spring bars, ensuring the lug seat is properly seated and the pins are fully inserted into their housings.

No, this is not recommended. An 18mm strap will be unstable in the spring bars, risking slippage and compromising both security and aesthetics. A 20mm strap does not seat correctly in the lug opening and forces the lugs. The 19mm lug width is specific to the 378 and requires precise mechanical compatibility for proper function and proportions.

Leather strap longevity depends on tanning method and usage patterns. An alligator or calf strap, with ordinary care and rotation with other straps, typically lasts 3–5 years. Vegetable-tanned leather ages visibly and may endure 4–7 years before structural failure. Canvas NATO straps resist 5–8 years, whilst FKM rubber straps last 6–10 years if protected from continuous solar exposure.