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1956 Omega Semaster Olympic "Pre-Commercial"

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

Delivery: ca.10 days

A beautiful and highly collectible timepiece made by Omega especially for XVI Olympics which took place in Melbourne in 1956. This particular watch belongs to a so-called "pre-commercial" series which was made by Omega in limited quantity (collectors say around 100 pcs) and then was followed by simplified "commercial" version. The pre-commercial Seamaster Olympic features a special solid gold case with caseback bearing Cross of Merit and a very special Chinese lacquer dial with the same Cross of Merit and Olympic rings in red color. Due to complexity and fragility of these dials, only a few survived in a completely untouched condition. This particular watch is one of them.

Extract of Archives. Professionally serviced in July 2018. Technical warranty: 1 year.


  • Solid 18k gold 2-body case with snap-on caseback.
  • Professionally polished in the past
  • 35 mm (without crown) / 42.5 mm (lug-to-lug) / 18 mm (between lugs)
  • Original faceted Omega crown
  • Reference: 2850 SC


    • Automatic chronometer with sweep seconds
    • Cal.471signed "Omega Watch Co Swiss"
    • Gold-plated, 19 jewels, 19800 A/h and 46 hours of power-reserve. Incabloc shock protection.
    • Serviced in July 2018


    • Original untouched chinese lacquer dial showing moderate aging
    • Minor cracks of the surface
    • Some fragments of the Cross of Merit are lost
    • Raised Omega logo at 12 o'clock, signed "Swiss Made" at 6 o'clock.
    • Raised golden "coffin"-shaped hour markers
    • Original golden hands

    Delivery set:

    • Generic leather strap with generic gold-plated buckle
    • Extract of archives
    • 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.