El Primero Chronomaster 45mm Ceramicised Aluminium and Rubber Watch, Ref. No. 24.2041.400/21.R576

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Editor's Notes

Zenith's El Primero calibre was the first ever automatic chronograph and still the only one capable of measuring short times to the nearest tenth of a second – in 1970, it was fixed to the landing gear of a Boeing 707 and, despite the high altitudes and atmospheric pressures, remained accurate upon landing - save for the inevitable time difference. This Swiss-engineered timepiece took nine months to make, in a painstaking process involving a series of 2,500 intricate operations. It's fitted with a tachymetric scale to measure speed, and a 400B automatic column-wheel movement which operates at 36,000 Vph and can be seen through the rear of the case's sapphire crystal exhibition window. The sturdy rubber strap rounds off its masculine, sporty feel and is perforated for comfortable aeration. We offer a two-year warranty for all working parts and manufacturing faults for luxury watches. Call our Customer Care team for more information.

Details & Care


  • Swiss-made automatic El Primero 400 B calibre 13 1/4" movement, with 50-hour power reserve
  • 31 jewels, 36,000 Vph
  • Oscillating weight with Côtes de Genève motif


  • Hour and minute hands, 12-hour counter, 30-minute counter, small second hand, date window
  • Chronograph stopwatch
  • Tachymetric scale


  • Blackened sunray dial, Super-LumiNova®-coated rhodium-plated hands and markers


  • Black ceramicised aluminium case
  • Crown for date and time adjustments and manual winding and stopwatch
  • Domed anti-reflective, scratch-resistant sapphire crystal and transparent case back
  • Clasp-fastening black rubber strap


  • Case diameter: 42mm; case thickness: 12.75mm
  • Water resistance: 10 bar
  • Comes in a presentation box
  • Reference number: 24.2041.400/21.R576
  • Manufactured in Switzerland
  • Made in Switzerland
Delivery and Returns
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Product Code 3633577410955408

Returns or Exchanges

Try your purchase in the comfort of your own home and, if it’s not quite right, let us know and we’ll arrange a free collection from your home or office.