Zenith Pilot Big Date Special Automatic Chronograph Watch 03.2410.4010/21 - Serviced

Watch Overview

This is a Zenith Pilot Big Date Special automatic chronograph wristwatch, reference 03.2410.4010/21. It has been fully serviced by Zenith in April 2026 and comes with the service documentation and a 1-year warranty.

Zenith has a long-standing connection to aviation and was one of the first brands to trademark the term “Pilot” in the early 20th century. The Pilot collection reflects that heritage with its bold Arabic numerals, highly legible dial layout, and functional timing features.

This watch is powered by the in-house Zenith El Primero caliber 4010, part of the legendary El Primero family introduced in 1969 as one of the first automatic chronograph movements.

It features 31 jewels, a central chronograph seconds hand, a 30-minute counter, small seconds, and a big date display with quick-set. The movement runs at a high frequency of 36,000 vibrations per hour and offers an approximate 50-hour power reserve.

The black dial is accented with luminous Arabic numerals, a clear minute track, and a telemeter scale along the outer edge. The big date display is positioned at 6 o’clock, with the 30-minute counter at 3 o’clock and small seconds at 9 o’clock, giving it a clean and balanced layout.

It is housed in a 42mm stainless steel case with sapphire crystal and an exhibition caseback, and is water resistant to 50 meters (164 feet / 5 ATM). The watch is fitted with a gray leather two-piece strap.

Fully inspected and authenticated by our in-house watchmaker, this timepiece is running accurately and ready to wear.

Product Details

General Specifications

• Brand: Zenith
• Type: Wristwatch
• Model: El Primero Pilot Big Date Chronograph
• Reference: 03.2410.4010/21
• Year / Era: Modern
• Gender: Men's
• Country of Manufacture: Switzerland

Dial & Display

• Display: Analog
• Color: Black
• Features: Arabic numerals, telemeter scale, big date display, small seconds, chronograph sub-dials, luminous hands and markers

Movement

• Type: Self-winding
• Caliber: Zenith El Primero 4010
• Jewels: 31
• Movement Functions:
  • SERVICED
  • Chronograph function
  • Central chronograph seconds hand
  • Small seconds hand
  • 30-minute counter
  • Big date display with quick-set
• Power Reserve: Approx. 50 hours
• Frequency: 36,000 vph

Case & Band

• Material: Stainless steel
• Case Shape: Round
• Bezel: Fixed, smooth
• Crystal: Sapphire
• Back: Exhibition
• Water Resistance: 50 meters / 165 feet / 5 ATM
• Band Type: Gray leather strap
• Case Back Markings: *Pilot*, 50M, 03.2410.4010 253160

Case Measurements (mm)

• Case Size: 42
• Case Diameter w/Crown: 46
• Case Lug to Lug: 50
• Case Thickness: 13
• Lug Width: 21
• Band Width: 21

Additional Info

• Box & Papers: NO – Zenith service papers included
• Condition: The watch is in very good condition, with a solid case, bezel, and dial.
• Notes: Serviced by Zenith in April 2026 with 1-year warranty.

About Second Hand Horology

At SECOND HAND HOROLOGY, we offer a curated selection of watches ranging from vintage to modern, including both brand-new and pre-owned timepieces. We’re committed to quality, accuracy, and integrity. Our listings feature:

Professional, unedited photography and clear, transparent descriptions. Every watch is thoroughly inspected and securely packaged to ensure a confident, seamless buying experience.

We also warmly invite you to visit our physical shop and explore the collection in person.

Contact Us

We appreciate you checking out our listing! Don’t hesitate to reach out with questions, offers, or just to talk watches — we love what we do and enjoy connecting with fellow enthusiasts.

Thank you for your business—we truly appreciate your support and look forward to serving you again in the future!

WA-6994