1950 Croton Clamshell Valjoux 92

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Free Worldwide Insured Courier Shipping / Authenticity Guaranteed / 14-days Inspection Period / 1-year Warranty

Rare and charming chronograph by Croton. It features amazingly preserved "Clamshell" waterproof case of a very special design patented in the mid-30s by Schmitz Freres SA. This case has 4 small screws behind the lugs to compress the two parts of the case. Various Swiss manufacturers used this design for their chronographs in various sizes from 30 to 38 mm.

This particular piece is notable for the mid-sized "clamshell" case which measures 35 mm without the crown, extremely attractive two-tone dial showing beautiful patina perfectly blue steel hands, and a reliable Valjoux 92-based movement. It is signed 4 times (double signed case, movement, dial). Another interesting feature - the signature is printed in an unusual part of the dial - at 6 o'clock rather than 12 o'clock. A true gem for a true collector!

Fully functional. Technical warranty: 1 year.


  • Stainless steel 2-body "clamshell" patented case (Brevet 189190)
  • Outstanding unpolished condition and sharp edges.
  • 35 mm (without crown) / 40 mm (lug-to-lug) / 18 mm (between lugs)
  • Original steel fluted crown. Original "mushroom" pushers.
  • Original plexiglass crystal.
  • Signed "Croton" and with patent number.


    • Manual-winding 2-reg 45-minutes chronograph
    • Valjoux 92 correctly signed "Croton Cal.380"
    • 17 jewels, 18000 A/h, 39 hours of power reserve, no shock-protection.
    • Service history is unknown. Timegrapher shows acceptable results: +4 seconds a day, 235 degrees of amplitude and 3 ms of beat error. 


    • Original untouched two-tone dial showing uniform aging
    • Signed "Croton" and "Swiss" at 6 o'clock. 
    • Original blue steel hands in good condition with intact radium-based lume
    • Excellent overall condition

    Delivery set:

    • The watch with hand-made tan calfskin strap.
    • Our company’s warranty certificate, invoice and general terms and conditions.

    Collections: Watches

    Category: Croton

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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.