This Zenith El Primero Rainbow Flyback Chronograph is a rare and unique timepiece designed for the French Air Force, but ultimately released to civilians. It features an automatic El Primero Caliber 405 movement and a 40mm × 12.6mm case.

• Case size: 40mm
• Movement: automatic El Primero Caliber 405
• Bracelet: original stainless steel

A Zenith El Primero Rainbow Flyback Chronograph with a rich history, designed for the French Air Force but later released to civilians. This watch features an automatic El Primero Caliber 405 and regular pushers instead of screw-down ones.

• Case size: 40mm
• Thickness: 12.6mm
• Bracelet material: Stainless Steel

A Zenith Rainbow El Primero Flyback Chronograph from the mid 1990s to early 2000s, featuring a tritium dial and hands. This watch is made of stainless steel and has a 40mm diameter.

• Condition: Has scratches on bezel, case, and bracelet. AR on crystal has some light scratches. Lugs have some indentations.
• Diameter: 40mm
• Material: stainless steel

A Zenith El Primero Rainbow Flyback Chronograph watch from the mid to early 2000s with a tritium dial. It's a 40mm stainless steel watch that fits a 7.5 inch wrist.

• Condition: Has scratches on bezel, case, and bracelet, some light scratches on crystal, indentations on lugs.
• Warranty: No service history
• Case material: Stainless Steel
• Size: 40mm diameter