Vintage Omega wristwatch Reference 2639 with caliber 265. This model, produced in the 1950s, is known for its classic design and 36mm stainless steel case. The 'two tone' dial features applied indices and a sub-seconds dial at 6 o'clock. The manual-winding Omega Caliber 265 movement is part of the renowned '30mm' series, valued for its reliability and ease of servicing. This watch is an example of timeless style and mechanical engineering of the era.