The Zenith El Primero is a legendary high-frequency automatic chronograph movement first introduced in 1969, featuring an integrated automatic chronograph movement that beats at 5 Hz (36,000 vph) and allows it to measure elapsed time with a precision of 1/10th of a second. The watch has a 'space-age' 1970s aesthetic and rocker style pushers.

• Condition: Excellent
• Case size: 42mm diameter
• Lug to lug: 44h
• Thickness: 14.3mm

A Zenith El Primero Big Blue from the 1970s, featuring a high-frequency automatic chronograph movement and an oversized TV-shaped case with a vibrant blue dial.

• Condition: Excellent for its age
• Case size: 42mm
• Lug to lug distance: 44h
• Crystal size: 14.3 cc

A Zenith El Primero ref. 01.0200.415 Big Blue circa 1973, a legendary high-frequency automatic chronograph movement with an oversized TV-shaped case and vibrant blue dial.

• Condition: Excellent for its age with light signs of polish and a recent private service
• Movement frequency: 5 Hz (36,000 vph)
• Bezel function: Chronograph
• Case size: 42mm diameter

The Zenith El Primero is a legendary high-frequency automatic chronograph movement first introduced in 1969, beating at 5 Hz and measuring elapsed time with precision. It features an oversized TV-shaped case with a vibrant brushed yachting metallic blue dial, often referred to as the 'Big Blue'. This watch has a unique 1970s aesthetic and is highly sought after by collectors.

• Condition: Excellent shape for its age, light signs of polish, private service in 2026
• Case size: 42mm
• Lug to lug length: 44h
• Thickness: 14.3 cc