Introduction This auction features a refined Seiko Automatic Open Heart (Ref. 4R39-00M0), a contemporary timepiece that showcases Seiko’s dedication to mechanical artistry. The sophisticated design is defined by its deep brown sunburst dial and a captivating "Open Heart" window at the 9 o'clock position, allowing a direct view into the balance wheel's rhythmic movement. Historical / Era context This model belongs to Seiko's modern mechanical lineup, utilizing the reliable Caliber 4R39 movement. Introduced as part of Seiko’s push to offer high-quality mechanical watches for the international market, the 4R series movement includes features such as hacking seconds and hand-winding capabilities. The two-tone aesthetic, combining stainless steel with gold-tone accents, remains a timeless design choice that bridges the gap between traditional luxury and modern reliability. Condition The watch is running properly. Case: The stainless steel case and gold-tone bezel are in very good condition, exhibiting only minimal surface marks consistent with careful handling. Dial: The sunburst brown dial is in excellent condition, with the rose gold-tone Roman numeral indices and hands catching the light beautifully. The 24-hour sub-dial at the 10 o'clock position remains perfectly functional. Crystal: The crystal is clear and well-preserved, providing a sharp view of the dial's intricate details. Band: Equipped with its original Seiko two-tone stainless steel bracelet, which shows minor surface wear but retains a solid and high-quality feel. Specifications Brand: SEIKO Model: Automatic Open Heart Reference: 4R39-00M0 Movement: Automatic (Cal. 4R39) Case material: Stainless steel / Gold-tone bezel Case diameter: 38.5 mm (excluding crown) Dial color: Brown Sunburst Band: Original Seiko two-tone stainless steel bracelet Wrist size: Approximately 15.5 cm Accessories: Original Seiko box Closing note The Seiko 4R39-00M0 is an excellent choice for those who appreciate the visual intrigue of mechanical movements in an elegant, modern package. Its combination of a 24-hour indicator and the open-heart display makes it both a functional and visually engaging piece. Please examine the photos carefully to confirm the condition before bidding.