El Primero (03.1260.4021)

The Zenith El Primero Chronomaster 03.1260.4021 is a showcase of fine Swiss watchmaking with an open-heart design that proudly displays its legendary movement. At the core of this timepiece is the iconic El Primero caliber 4021 — a high-beat automatic chronograph movement famed for its precision and horological pedigree. The partially open dial offers a glimpse into the escapement, merging engineering marvel with visual drama. This model balances sportiness and sophistication, making it equally at home under a cuff or on full display. With classic chronograph layout, Roman numeral indices, and a high-polish stainless steel case, the Chronomaster is a refined, yet bold piece for any collector or enthusiast of mechanical excellence.

The El Primero Chronomaster 03.1260.4021 features a 40mm polished stainless steel case, offering a comfortable and balanced wrist presence. The black dial features an open-heart cutout at 10 o'clock, exposing the escapement and showcasing the signature El Primero high-frequency movement. A power reserve indicator is positioned between 5 and 6 o'clock, while the running seconds sub-dial sits at 9 o'clock.

Blue and gold-toned hands, paired with applied Roman numeral hour markers, create an elegant contrast and enhance legibility. A sapphire crystal protects the dial, while a matching sapphire case back reveals even more of the meticulously finished El Primero 4021 movement.

The watch is powered by the in-house El Primero automatic chronograph movement beating at 36,000 vibrations per hour, providing a power reserve of approximately 50 hours. It comes fitted on a brown alligator leather strap with a deployant clasp, offering comfort and a touch of timeless class.

This watch is in excellent condition with minimal wear. The lugs are sharp, and the sapphire crystal is clean and scratch-free. The dial and hands are perfect, and all functions, including the open-heart escapement, power reserve, and chronograph, work as they should. The genuine alligator strap shows light creasing from light use but is still in very good condition with no cracks or fraying.

What do the different grading scores mean?

• BN 9.9: Brand new and unworn, with no signs of use.
• UN 9.5: Like new and unworn, but may lack original packaging or materials such as the box, links, tags, or bezel protector.
• LN 9.0: Like new and unworn, but only includes the watch without papers, box, or accessories.
• MT 8.5: Mint condition, lightly used with minor surface scratches or wear. Unpolished.
• VG 8.0: Moderately used, with scratches and one or two nicks on the case or crystal. Shows signs of polishing. The bracelet remains snug with minimal wear.
• GD 7.5: Shows signs of daily wear but is not abused, with noticeable polishing on the case. The bracelet shows clear signs of daily wear.

Watches with a rating below GD 7.5 are not listed for bidding to ensure that only high-quality timepieces are available to our members.