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1950 Eberhard Extra-fort Jumbo "Monopusher"

Authenticity Guaranteed / 14-days Inspection Period / 1-year Warranty

Delivery: ca.10 days

Charming and fashionable chronograph by Eberhard from the early 1950s. It features incredibly wearable today (and incredibly big back in the 50s) 39 mm solid gold case and beautifully designed Caliber1600 based on Valjoux 65. This caliber is known not only for the big size requiring a big case, but also for an unusual system - the chrono is operated with a single upper pusher (and is, in fact, a classic monopusher), 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 rare and mint dial with 45-min sector at the minutes counter and excellent condition of the case.

The watch went through complete service in November 2018. 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 detailed.
  • 39 mm (without crown) / 46 mm (lug-to-lug) / 20 mm (between lugs)
  • Original signed crown and original pushers.


    • 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 November 2018


    • Original untouched dial in excellent condition. Minor aging of the surface.
    • Signed "Eberhard" at 12 o'clock. Signed "Extra-fort" and "Swiss Made" at 6 o'clock. Raised golden hour markers.
    • Rare and unusual layout of the minutes counter
    • 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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    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.