1950 Eberhard Extra-fort Jumbo Monopusher

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Delivery: ca.10 days

Charming and fashionable chronograph by Eberhard from the early 1950s. It features incredibly wearable now (and incredibly big back in the 50s) 39 mm solid gold case and beautifully designed cal.1600 based on Valjoux 65. This caliber is known not only for the big size requiring big case, but also for an unusual system - the chrono is operated with single upper pusher (as typical momopusher), while the lower pusher is actually a slider, which is used to lock or unlock chrono function. 

This particular piece is notable for a very good looking dial, sharp yellow gold case and freshly overhauled movement. 

The watch went through complete service in March 2017. Technical warranty: 1 year.


  • Solid 18k yellow gold 3-body case with snap-on case back. High polished finishing.
  • Showing strong geometry and sharp edges. Professionally polished.
  • 39 mm (without crown) / 46 mm (lug-to-lug) / 20 mm (between lugs)
  • Original signed crown and original pushers.
  • Possibly service plastic crystal.


    • Manual-winding 2-reg monopusher chronograph
    • Cal.16000 signed "Eberhard & Co" based on Valjoux 65
    • 17 jewels, 18000 A/h, 40 hours of power reserve, no shock-protection.
    • Fully serviced in March 2017


    • Original untouched dial in good condition. Minor ageing of the surface and scratches.
    • Signed "Eberhard" at 12 o'clock. Signed "Extra-fort" and "Swiss Made" at 6 o'clock. Raised goledn hour markers.
    • Original hands in good condition.

    Delivery set:

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

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    Collections: Watches

    Category: Eberhard

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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.