1951 Omega Ref.2505 Jumbo Cal.265

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Attractive and sought after classics by Omega. This particular piece is notable for a beautiful two-tone silver dial with gilt numerals and a shiny oversize 38 mm case made of stainless steel. The movement inside is the manual-winding caliber 265 - a memer of the famous 30T2 series. Big, beautiful, reliable.

Professionally serviced in December 2017. Technical warranty: 1 year.


  • Stainless steel 3-body case with snap-on case back. Satin and high-polished finishing.
  • Professionally polished. Showing no traces of use.
  • 38 mm (without crown) / 46 mm (lug-to-lug) / 18 mm (between lugs)
  • Original signed crown
  • Service plexiglass crystal


    • Manual-winding with small seconds hand
    • Cal.265 signed ‘Omega’.17 jewels, 18000 A/h and 43 hours of power-reserve. Antimagnetic. Incabloc shock protection. 
    • Serial number: 12.9 million
    • Excellent condition. Professionally serviced in December 2017.


    • Untouched original dial in very good condition. Showing minor ageing on the outer perimeter and barely visible spotting in the middle section.
    • Gilt Arabic numerals and beveled gilt hour markers.
    • Signed "Omega" at 12 o'clock. 
    • Original golden hands in outstanding condition.

    Delivery set:

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

    Collections: Archive

    Category: Omega

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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.