This classic timepiece is the Omega Seamaster Cosmic 2000 vintage automatic mechanical watch. Born in the early 1970s, this series boasts a unique design and historical significance. Large Case: Approximately 38 mm in diameter, a very rare "jumbo" size in the 1970s, it doesn't look small even today, exuding a grand presence. Unique Structure: The Cosmic 2000 pioneered a "double-layer case (container system)" design. The movement is encased in an inner stainless steel container, then pressed into the outer case via a rubber waterproof gasket. This special structure enhances airtightness and dust resistance. ~~Service performed in August 2026~~ 【Brand Series】 Omega / Seamaster Cosmic 2000 【Official Model Number】 166.128 【Year of Production】 Circa 1973 (Movement serial number 37,xxx,xxx) 【Core Movement】 Original Cal.1012 automatic movement (features stop seconds and automatic/manual winding) 【Exterior Material】 Stainless steel case/gold-plated, original Ω-marked crown 【Dial Size】 38mm diameter (excluding crown) "Jumbo" model 【Compatible Strap】 Replacement strap, replacement buckle, maximum fits up to 21mm 【Product Condition】 Timekeeping and quick-set function are fully functional. (Antique mechanical watches are highly precise; please do not force quick-set between 9 PM and 3 AM to avoid damaging the gears.) Shipping: Delivery Method: Postal delivery, EMS. Estimated arrival time: 5-20 days after shipment. Arrival time may be delayed due to postal service or customs procedures. Tracking number provided. Customs and Taxes: Additional customs duties or taxes may apply depending on the import regulations of your country. These costs are borne by the buyer. It is recommended to check local customs policies before purchasing. After-sales Support: We are a pre-owned watch and antique dealer from Taiwan with over 20 years of experience. We aim to provide you with unique vintage watches. Upon receiving the watch, please carefully inspect it to ensure everything is working properly. If you encounter any problems, please feel free to contact our after-sales support team. We are committed to resolving issues quickly and professionally.