Introduction This Citizen Eco-Drive model equipped with the C660 module represents one of the brand’s most functional and reliable hybrid analog-digital designs. With its bold aesthetic, sailing-oriented bezel markings, and advanced timing functions, it is a practical yet collectible sports watch suitable for both daily wear and professional use. Historical & Collector Value Citizen’s Promaster and specialized Eco-Drive models have long been appreciated by collectors for their durability, technological innovation, and solar-powered reliability. The C660 movement—combining multiple chronograph, timer, alarm, and world-time functions—reflects Citizen’s commitment to highly practical tool watches. With its gold-tone case and complex multi-function dial, this model offers distinctive visual appeal and is an excellent choice for collectors seeking a functional yet uncommon Eco-Drive reference. Specifications Brand: Citizen Model: Eco-Drive Analog-Digital (Promaster series) Reference / Case Back No.: C660-S067634 Movement: Citizen Eco-Drive Solar (Cal. C660) Case Material: Gold-tone Stainless Steel Strap Material: Black Rubber Case Size: Approx. 45 mm (excluding crown) Water Resistance: 20 Bar (as indicated) Features: Analog-digital hybrid display Chronograph, countdown timer, alarms World time & sailing-related bezel indications Solar charging (no battery replacement needed) Serial Number: 62050518 (as shown) Accessories: Watch only (no box or papers) ・Condition The watch is in very good overall condition, showing only light signs of use on the case. The bezel, dial, and crystal are clean and easy to read. All digital displays function properly. Strap is in good condition with no sticky feel. All functions—including analog hands, chronograph, alarms, and digital modes—operate correctly. ・Service History ✓ Fully functional — all operations confirmed ✓ Eco-Drive charging checked and stable These points ensure that the buyer can enjoy the watch with confidence. ・Shipping & Customs The item will be shipped securely with tracking. International buyers: customs duties, taxes, and import charges are the responsibility of the purchaser.