This is a vintage Seiko Seikomatic, reference 6206-8100, manufactured in February 1966, confirmed by the original Seiko serial number. The Seikomatic series represents one of Seiko’s higher-grade automatic lines of the 1960s, positioned above Seiko 5 and standard Sportsmatic models. This model is powered by the caliber 6206 automatic movement, featuring 26 jewels and a solid, reliable construction typical of Seiko’s mid-1960s mechanical engineering. A notable highlight of this watch is the Dolphin caseback, a signature used by Seiko to indicate improved water resistance at the time. The dolphin emblem is highly regarded among collectors and clearly distinguishes this piece from lower-tier models. The silver dial has a refined sunburst finish and is fitted with applied hour markers, offering a clean and elegant appearance. The day-date display is characteristic of this caliber: Date is adjusted by pulling the crown to the first position Day is changed by rotating the hands The day display is Japanese (Kanji), adding authenticity and vintage appeal The watch is currently running at the time of listing. As this is a vintage mechanical timepiece, long-term accuracy, power reserve, and water resistance are not guaranteed. The case shows visible signs of age and wear, consistent with a watch that has been used for decades. These marks are honest and original, contributing to the character of a true vintage Seiko. The strap is a new leather strap and is not original, but selected to match the classic design of the watch. This Seikomatic is an excellent example of Seiko’s golden-era craftsmanship and a strong choice for collectors seeking an authentic 1960s Japanese automatic watch with historical significance. The watch will be carefully packed and shipped with tracking to ensure safe delivery.