Technical Archive

Zenith
El Primero 18.2041.400/76.C795— lug 21mm

Zenith El Primero 18.2041.400/76.C795: 21mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

El Primero Chronomaster Range Rover 42 Rose Gold / Brown / Alligator

Artisanal Note

"This model requires a precise 21mm lug width to preserve the original sartorial balance."

Technical Specifications

Zenith 18.2041.400/76.C795
Lug Width
21 mm

The essential strap measurement.

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Reference

18.2041.400/76.C795

Movement

Zenith caliber El Primero 400B Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel

The Heritage

The Zenith El Primero was introduced in 1969 as the first automatic high-frequency chronograph movement. It houses the El Primero 400B caliber with column-wheel, chronograph function, small seconds and date. 21mm lugs for the strap.

FAQ

What is the exact lug width of the Zenith El Primero 18.2041.400/76.C795?

The lug width of this model is precisely 21mm. Measure the internal distance between the lug pins to verify compatibility. This specific thickness was deliberately chosen by Zenith to maintain the visual and structural balance of the 42mm case, ensuring the strap neither appears disproportionate nor becomes unstable.

Which strap is best suited for the Zenith El Primero 18.2041.400/76.C795?

For this rose gold reference, we recommend semi-matte alligator in dark chestnut tones, which enhances the natural warmth of the gold and creates harmonious chromatic continuity. Alternatively, full-grain vegetable-tanned calf develops a burnished patina that subtly blends with the rose gold over time, ideal for those who appreciate natural leather ageing.

How do you change the strap on the Zenith El Primero 18.2041.400/76.C795?

Use a spring bar tool to extract the pins from the lugs. Position the tool in the small groove of the pin, gently lifting until the pin disengages. Repeat on both sides. Insert the new strap by aligning the first pin, then the second, pressing until you hear a distinct click. Verify both pins are completely locked before wearing the watch.

Can I use an aftermarket 21mm strap on my El Primero?

Yes, any strap with a 21mm lug width is compatible with the Zenith 18.2041.400/76.C795. Milanostraps offers handcrafted 21mm straps fully customisable in leather type, material finish and colour. Simply ensure the strap thickness is not excessive, as this could create unwanted play at the lugs.

What is the average lifespan of a leather strap for the El Primero?

A quality leather strap with vegetable tanning and artisanal construction typically lasts 3–5 years with regular wear. Lifespan depends on humidity, frequency of use and climatic conditions. Alligator straps generally last longer owing to greater thickness and inherent resilience. With proper care—occasional cleaning and dry storage—longevity can extend significantly beyond these estimates.

The next step

The right strap isn’t chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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The atelier's website: casatimilano.com