A distinctive vintage Seiko Solar Titanium multi-function wristwatch, reference 5K21-0A20, combining a lightweight titanium case with a silver-tone dial, gold-tone accents, and three subsidiary displays for day, date, and 24-hour indication. Stylistically characteristic of Seiko’s 1990s multi-function designs, the watch reflects an early generation of solar-powered quartz technology combined with a compact titanium case. Based on the serial number and the characteristics of the Cal. 5K21 series, the watch is considered consistent with production around the mid-1990s, although the exact production date cannot be independently confirmed. **Specifications** Case Diameter: 36.8 mm Case Thickness: 10.2 mm Lug Width: 18.1 mm Wrist Size: up to approximately 18.0 cm Movement: Seiko Cal. 5K21 solar quartz Material: Titanium Water Resistance: 10 BAR Origin: Japan Case Reference: 5K21-0A20 Serial Number: 683869 The watch measures approximately 36.8 mm in case diameter and 10.2 mm in thickness, with a lug width of approximately 18.1 mm and fitting a wrist of up to approximately 18.0 cm. The watch shows scratches, rubbing, and surface wear consistent with age and prior use, particularly on the titanium case, bezel, lugs, and case back. The silver-tone dial remains comparatively well preserved, with the printed details, indices, and subsidiary displays appearing clear. No major cracks or chips are apparent on the crystal from the available information, although minor surface marks may be present. The gold-tone crown shows signs of use. The watch is fitted with a brown leather strap which shows substantial wear, including cracking, rubbing, and deterioration to both the outer and inner surfaces. The strap has not been confirmed as original to the watch. The current solar charging performance, long-term accuracy, energy storage capacity, and duration of operation have not been measured and therefore cannot be guaranteed. A distinctive timepiece suitable for collectors and enthusiasts of vintage watch design. Shipping is from Japan, primarily via DHL, FedEx, or Japan Post. Depending on the buyer’s country, import duties or consumption tax may apply and are the responsibility of the buyer. Please note that courier collection is not available on weekends, so shipments are made on weekdays only. --- **Notice for EU Buyers** From July 1, 2026, shipments to EU countries may be subject to additional import-related charges, including customs processing fees, handling fees, import duties, VAT, or other customs-related charges, depending on the destination country and shipping carrier. These charges are determined by local customs authorities and/or the shipping carrier and are the buyer's responsibility. Please check your local import regulations before bidding or purchasing. ---