• Brand: OMEGA
    • Made 1943
    • Model: Chronograph
    • Reference: CK 710 
    • Calibre: 33.3
    • Movement: Manual
    • Material: Stainless steel
    • Features/complications: Chronograph
    • Dial: White enamel dial featuring minute track to 1/5 of second with blue, red, green and black tachymetric scale with empire Arabic hour numerals, subsidiary seconds at 9 o'clock and 30 minute counter at 3 o'clock (both recessed), blued hour and minute hands and center chronograph hand
    • Case dimensions: 38mm
    • Bracelet/strap: Leather strap
    • Accessories: Extract from the Archives
    • SKU: 03169


Developed by Lemania in 1933 the OMEGA manual winding chronograph 33.3 and was a technical marvel for its time and is still revered by collectors today. The 33.3 was far larger than most chronographs for its time and became a favourite of many military forces as well as explorers of the day. The three-piece stainless-steel case is in great condition with well-defined crisp edges to the lugs.

This calibre was initially produced with an independent start-stop reset mono-pusher located at 2 o’clock. However, like the calibre 28.9, a version with two pushers was introduced in 1938: a separate stop-start pusher and a reset pusher integrated into the crown or at 4 o’clock. Anti-shock and anti-magnetic was introduced in 1942 and the name of the calibre 33.3 CHRO changed in 1949 as two lines of chronograph models were introduced: the calibre 170 used to equip non-resistant models and the calibre 171 to equip water-resistant models.

The calibre 33.3 CHRO was regarded as a very precise and reliable movement with 14,000 pieces produced until 1952.