Seiko DX 27 Jewels – Ref. 5139-7010 – Vintage Automatic Day-Date Watch A refined and increasingly collectible Seiko DX from the early 1970s, featuring the robust Calibre 5139 automatic movement with 27 jewels. The Seiko DX line represented a step above the standard Seiko 5 series, offering upgraded finishing, higher jewel counts, and elegant dress-watch aesthetics. This example stands out with its beautiful silver sunburst dial, distinctive fluted bezel, and exposed movement photographs that showcase the original Japanese automatic calibre. ⸻ Specifications • Brand: Seiko • Model: DX • Reference Number: 5139-7010 • Movement: Seiko Calibre 5139 Automatic • Jewels: 27 Jewels • Functions: Hours, Minutes, Central Seconds, Day-Date • Day Display: English Day Wheel • Dial: Original Silver Sunburst Dial • Hands: Original Hands • Indices: Original Applied Baton Indices • Crystal: Acrylic Crystal • Bezel: Fluted Stainless Steel Bezel • Case Material: Stainless Steel • Case Back: Original Signed Stainless Steel Case Back • Country of Manufacture: Japan ⸻ Condition • Original silver sunburst dial remains clean and well preserved. • Applied baton indices retain excellent definition and shine. • Original hands appear correct and well matched to the dial. • The distinctive fluted bezel remains one of the most attractive design elements of this reference. • Day-date display operates correctly and changes as intended. • Stainless steel case retains strong lines with only minor signs of age-related use. • Original case back engravings remain crisp and legible. • The movement has been photographed and appears clean and well maintained. • Fitted with a quality aftermarket black leather strap. • The watch has been tested on a timegrapher. • It has also been worn and monitored over several days to verify reliable performance. • Running correctly and keeping time appropriately for a vintage automatic watch. • All functions operate properly at the time of listing. • Please review all photographs carefully, as they form part of the description. ⸻ Important Notes • Tested on a timegrapher and worn over several days to confirm proper operation. • Vintage automatic watches may not perform to modern chronometer standards. • Water resistance cannot be guaranteed due to age despite the original factory markings. • Vintage watches may have undergone servicing during their lifetime. • Customs duties, VAT, and import taxes remain the buyer’s responsibility. ⸻ Shipping The watch will be carefully packaged and shipped worldwide via DHL Express to ensure safe and secure delivery.