Strap for D-Series Stainless Steel / Blue / NATO

The lug width of the Elka Watch Co. D-Series D02-0902 is precisely 20.00 mm. This measurement is the distance between the two spring bars that secure the strap to the case. To verify, remove the strap and measure the distance between the two attachment points on the case. Do not confuse this dimension with the strap thickness, which is an independent parameter.

For the D02-0902, vegetable-tanned leather straps (calf, shell cordovan) are recommended if you seek natural patina development over time, or rubber straps if intended for intensive use in humid or cold environments. For hybrid options, a cotton NATO strap with tight weave offers breathability and structural stability. Your choice depends on use context: daily instrumental use suggests rubber, formal-casual suggests calf, military or aviation suggests NATO.

To change the strap, obtain a spring bar tool (a specialized instrument for removing strap pins). Insert the flat tip into one of the holes beneath the case, on either side of the 20 mm lug width. Press gently to release the spring bar from its seat. Repeat on the opposite side. The old strap will detach. To install the new strap, insert the bars into the holes of the new strap, then push the bars toward the case until they click into the seats below. Verify the strap is secured firmly on both sides before wearing.

Yes, any strap designed for a 20 mm lug width is compatible with the D02-0902. MilanoStraps offers options in vegetable-tanned leather, shell cordovan, natural rubber, and NATO. Always verify the strap is specified for 20 mm and that thickness is proportionate to the case (typically 3–5 mm is ideal). Artisanal strap manufacturers offer greater control over patina development and ageing characteristics.

A quality leather strap (calf or shell cordovan) typically lasts between 18 and 36 months with daily wear, depending on humidity exposure, perspiration contact, and wear frequency. Vegetable-tanned calf tends to fail sooner if exposed to constant moisture; shell cordovan resists longer as the fibres are denser. To extend lifespan, avoid regular water exposure and allow the strap to dry completely after occasional contact with moisture. The patina forming in the first year is part of the natural ageing process, not deterioration.