This is a vintage Seiko Seikomatic-R, reference 8346-9010, manufactured in November 1966. The Seikomatic-R series represents one of Seiko’s most sophisticated mechanical watch lines of the mid-1960s. Developed during Japan’s period of rapid economic growth, it was positioned clearly above standard automatic models, combining advanced movement engineering with refined case design. Within Seiko’s mechanical hierarchy of the era, the Seikomatic-R occupied a high-grade position just below Grand Seiko and King Seiko. This model features a distinctive fluted bezel and the Dolphin emblem engraved on the case back. The dolphin motif was used by Seiko at the time to express enhanced water resistance concepts and durability, and today it remains an important design symbol associated with Seiko’s upper-tier mechanical watches of the 1960s. The silver dial presents a clean and well-balanced layout with applied hour markers, reflecting the restrained elegance and functional clarity that defined Seiko’s higher-grade designs of the period. The watch is powered by Seiko’s 27-jewel automatic movement, developed for stable daily use and long-term reliability. At the time, a jewel count of 27 placed this movement well above ordinary automatic calibers, emphasizing durability and mechanical refinement rather than mere specification competition. On this particular watch, the calendar operates as follows: The date can be adjusted by pulling the crown to the first position. The day is adjusted by rotating the hands through a full 24-hour cycle. The day display is English only. These functions have been confirmed on this watch. The case shows honest signs of age consistent with a vintage timepiece, reflecting decades of use while retaining its original form and strong presence. The watch is fitted with a new leather strap, making it ready to wear. Running at the time of listing. As a vintage watch, stable operation, accuracy, and water resistance are not guaranteed. The watch will be carefully packed and shipped with tracking for safe delivery.