I've had this cutie patootie in my vintage collection for many years. Rare pulsations dial for the docs. Note the crown is not original. Chronograph works as it should. Ships from Denver $3,500 + $35 Fedex 2 day shipping in North America. Zelle, PayPal, Venmo f&f to established accounts. From Ai: The **Omega Calibre 320** is one of the most prestigious vintage chronograph movements ever produced by Omega. While the famous Calibre 321 powered the Speedmasters that went to the moon, the **Calibre 320** is its equally refined, **two-register** (bi-compax) sibling. Produced between **1942 and 1968**, this movement is a "column-wheel" chronograph, a technical architecture that is highly prized by collectors today for its smooth operation and historical importance. # Key Specifications * **Movement Type:** Manual-wind, column-wheel chronograph. * **Registers:** Two sub-dials (Small seconds at 9:00, 30-minute counter at 3:00). * **Beat Rate:** 18,000 A/h (2.5 Hz). * **Power Reserve:** Approximately **44 hours**. * **Base Movement:** Developed by **Lemania** (Calibre 27 CHRO).. # Why Collectors Love It * **The "321 Connection":** It shares about 90% of its parts with the legendary Calibre 321. The main difference is that the 320 lacks the 12-hour totalizer, resulting in a cleaner, more symmetrical dial. * **Elegant Design:** While the 321 is associated with "tool" watches like the Speedmaster, the 320 was almost exclusively used in **elegant dress chronographs**. You will often find it in solid 18k gold cases with beautiful "leaf" or "dauphine" hands. * **Relative Rarity:** Because it was produced in smaller quantities than the three-register versions, finding an original, unpolished Cal 320 is a milestone for vintage Omega enthusiasts.