a vintage Omega "Calatrava" a classic model dating from the late 1940s to early 1950s.Key Features and IdentificationModel/Reference: These watches are often referred to as "calatrava" due to the 36mm case, which was considered very large for its time. Reference codes for this design are 2605-3. Dial: It has a sub-seconds dial at position 6, Arabic numerals at even positions (12, 2, 4, 8, 10) and leaf-shaped hands. Movement: They operate with manual wind mechanisms, like the legendary Calibre 267 series. Condition: The dial presents a natural patina (color change over time), which is highly appreciated by vintage watch collectors as it indicates its authenticity, the watch has been maintained by a professional watchmaker and has a genuine leather strap.