Zenith
El Primero 03.2040.400/26.R576— lug 21mm

The lug width of the Zenith El Primero 03.2040.400/26.R576 is 21 millimetres. This measurement represents the internal distance between the two spring bars that attach the strap to the case. It is essential to verify this dimension with precision using a calliper to ensure proper fit without lateral play.

For the Zenith El Primero 03.2040.400/26.R576, straps in Mississippi alligator (for formal occasions and noble ageing), vegetable-tanned calf leather (versatile and elegant), or shell cordovan (rigid and lustrous) are recommended. For sporting contexts, a nylon NATO or FKM rubber strap ensures practicality. Your choice depends on personal style and primary wearing context.

To change the strap, you must remove the spring bars that hold it in place. Use a spring bar tool (a specialised small implement) to compress the bar and slide it out of the lug housing on the case. Proceed carefully to avoid scratching the steel. Insert the new strap by aligning the holes at the same height, then re-insert the spring bars. If uncertain, a skilled watchmaker can perform this task in a few minutes.

Yes, the Zenith El Primero 03.2040.400/26.R576 accepts any quality strap with a 21-millimetre lug width. Artisanal aftermarket straps, crafted with premium leathers and manual stitching, often represent a superior choice to original factory straps: they offer greater customisation, a choice of noble materials (alligator, shell cordovan, calf leather), and more refined stitching. Ensure the lug width is exactly 21mm.

The lifespan of a leather strap depends on wearing intensity and craftsmanship quality. An artisanal strap in premium leather (alligator, shell cordovan, calf) with manual stitching typically lasts between 3 and 7 years of regular daily use before requiring replacement or maintenance. The patina that develops on the leather is considered a positive characteristic, as it testifies to authenticity and natural wear. Careful maintenance (gentle cleaning, drying after humidity exposure) significantly extends longevity.