1952 Zenith Cal.135 Chronometer Jumbo

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14-days Inspection Period / 1-year Warranty

Delivery: ca.10 days

This timepiece is truly fascinating inside and out. This Zenith looks incredibly elegant offering very classic design of the case, clean white dial with a minimalistic design. It is even more remarkable inside the case thanks to a piece of a true horological art - Caliber 135. Designed by Ephrem Jobin and introduced in 1948 at the height of a battle for precision fought among major Swiss watch manufacturers in the Observatory competitions, Caliber 135 included innovative engineering solutions that allowed it to win many prestigious awards, including an unprecedented 5 consecutive Neuchâtel Observatory chronometry prizes from 1950 to 1954. All in all, the movement achieved about 200 honors, two-thirds of which were first prizes.

This particular piece comes from 1952 and even though it has a completely original dial, hands, and movement, the case was swapped in the past. The current case is unsigned, crafted of solid 18k rose gold and is of the very same quality as original Swiss case. The price is adjusted accordingly - the same piece with Zenith signed case will cost at least 100% more.

Aftermarket 18k solid gold case. Professionally serviced in May 2018. Technical warranty: 1 year.


  • Solid 18k rose gold 3-body case with snap-on case back. High-polished finishing.
  • Perfect condition showing no traces of use.
  • 37 mm (without crown) / 44 mm (lug-to-lug) / 18 mm (between lugs)
  • Handcrafted rose gold crown
  • Aftermarket plexiglass crystal


    • Manual-winding high-grade chronometer
    • Cal.135 signed ‘Zenith’.19 jewels, 18000 A/h and 43 hours of power-reserve.
    • Serial number: 4217777
    • Professionally serviced in May 2018.


    • Untouched authentic white dial showing minor aging of the surface. Excellent overall condition.
    • Raised golden hour markers and Arabic numerals.
    • Signed "Chronometre Zenith" at 12 o'clock. Correctly signed "Swiss" at 6 o'clock.
    • Original golden hands in excellent condition.

    Delivery set:

    • The watch with high-quality generic leather strap and generic gold-plated buckle
    • Our company’s warranty certificate, invoice and general terms and conditions

    Collections: Watches

    Category: Zenith

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    Sizing Product

    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.