1950 Zenith "Pilot's" Waterproof Chronograph

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Charming and charismatic timepiece made by Zenith in ca.1950. It is powered by manual-wound cal.143-6 supplied by famous Excelsior Park (based on EP4), on of the best chronograph manufacturers of that time. Even though it is not known for sure, the design of this watch tells us, that it was purely a tool watch, for example for pilots. It features unusually big "waterproof" all stainless steel 37.5 mm case with screw-down case back and mushroom pushers, famous and precise cal.143-6 based on EP4 and fantastic silver dial turned into a creamy tone. More than that, the dial features radium luminous markers and beautiful radium dauphine hands. 

The watch went through complete service in 2016. Technical warranty: 1 year.


  • Stainless steel 3-body case with screw-down case back. Mixed satin and high polished finishing.
  • Showing strong geometry and sharp edges/facets. Possibly unpolished. Minor traces of use, minor scratches. No dents, no deep scratches.
  • 37.5 mm (without crown) / 43 mm (lug-to-lug) / 20 mm (between lugs)
  • Original steel unsigned crown. Original "mushroom" pushers.
  • Possibly service plastic crystal.


    • Manual-winding 2-reg 45-minutes chronograph, pillar wheel seconds.
    • Cal.143-6 (basedcaliber EP 4) signed "Zenith" and "Swiss Made".
    • 17 jewels, 18000 A/h, 40 hours of power reserve, Incabloc shock-protection.
    • Fully serviced in September 2016


    • Original untouched dial in good condition. Tiny scratches on the minutes counter's sub-dial and tiny dot at 5 o'clock barely visible with naked eye. 
    • Signed "Zenith" at 12 o'clock and "Swiss Made" at 6 o'clock. Arrow hour markers with radium plots.
    • Original silver steel hands with radium in fair condition showing certain oxidation. Minute hand's tip is slightly bent.
    • Good overall condition, showing homogenous aging and very light spoting.  

    Delivery set:

    • The watch with generic leather strap and generic buckle
    • Suede leather watch travel case
    • Our company’s warranty certificate, invoice and general terms and conditions.

    Collections: Archive

    Category: Zenith

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    Measuring a watch

    It is always crucial to understand the size of the watch, especially when it comes to vintage watches which are generally considered as too small in comparison with what watch industry offers today. For example, the original Patek Philippe Calatrava introduced in the 1930s was only 31 mm in diameter, while today's classic Calatrava is 39 mm. When you think about 8 mm, it doesn't seem to be a big difference, but believe it is.

    In our condition reports we normally disclose three most important parameters as follows: diameter without crown / lug-to-lug length / lug width. 

    Diameter without crown

    It is, so far, the most important measurement to understand the size of a regular round-shaped watch.It helps you to understand proportions and overall look of the watch. It is important to consider width of the bezel and color of the dial, because certain combinations may make the watch look bigger, while some other smaller. It is all very individual, however there is common understanding:

    Lug-to-lug width

    This parameter will help you to understand whether the watch is comfortable for wearing. You should compare lug-to-lug width with the width of your wrist, and if lug-to-lug width is smaller or equal, then this watch shall be comfortable.

    Lug width

    This measurement is defining what size of strap you need for the particular watch. Depending on era and manufacturer you can find watches with lug width between 14 mm and 24 mm. Most common sizes are 18 mm and 20 mm.