Presented for auction by Second Vintage A captivating example of Seiko's mid-century design mastery, this Seikomatic-R represents a beautiful era of Japanese watchmaking. Combining an elegant gold-plated profile with a highly capable thirty-jewel automatic movement, this timepiece was engineered for both durability and sophistication. The presence of the iconic dolphin motif on the caseback signifies its original water-proof designation, a testament to Seiko's commitment to everyday reliability. Well preserved with an attractively aged character, this piece offers collectors a charming dial, subtle period detail, and an elegantly restrained aesthetic that remains incredibly versatile today. Brand: Seiko Model: Seikomatic-R Reference Number: 8305-0020 Serial Number: 5408828 Movement: Automatic, Caliber 8305B, 30 Jewels Dial: Silver sunburst dial with applied gold-tone indices, small mark near 6 o’clock, some dial and light scratching on the crystal Case Size: 37 mm (excluding the crown) Case Material: Gold Plated (SGP) with Stainless Steel caseback Production Year: 1965 Condition: Well-preserved vintage condition with light signs of use Dial and Hands The dial stands out with its striking silver sunburst finish that catches the light elegantly. It is adorned with applied gold-tone faceted indices, featuring a prominent double-faceted marker at twelve o'clock. The dial typography is crisp and fully intact, with the Seikomatic-R and Diashock thirty jewels branding clear. There is a framed date aperture at three o'clock. Gold-tone dauphine hands remain sharp and highly polished, complementing the indices nicely. A small mark is noted near the 6 o’clock position, but overall the dial displays well without any major distraction, and aside from this and some light aging, it maintains a clean and attractive vintage look. Case and Crystal The 37mm gold-plated case features a smooth, elegant bezel and gracefully tapered lugs. The case lines are well-defined, showing typical, honest handling marks consistent with careful vintage use. Gold plating maintains a warm tone across the mid-case and bezel. The recessed crown at four o'clock integrates seamlessly into the design. The stainless steel caseback displays clear engraving with the iconic Seiko dolphin motif, along with the reference 8305-0020 and serial number 5408828. The domed acrylic crystal shows some light scratching but no deep scratches or distracting flaws. Movement Inside, the Seiko caliber 8305B automatic movement offers reliable vintage performance. The movement exterior reveals clean brushed surfaces on the rotor and crisp factory engravings. Strong timegrapher results of +15 to +17 seconds per day confirm healthy performance. Strap Fitted with a black leather strap featuring yellow contrast stitching, this strap pairs well with the watch’s gold-tone accents, secured with a matching gold-tone buckle. Condition This Seikomatic-R is in well-preserved vintage condition. The dial retains much of its original charm with a small mark near 6 o’clock and some aging. The acrylic crystal and gold-plated case have light surface wear in line with age, and the caseback engravings remain sharp and highly legible. The watch is running within vintage tolerances. Dimensions Case Size: 37 mm (excluding the crown) Remarks This is a wonderful opportunity to acquire a handsome, mid-century Seikomatic-R with an authentic vintage aesthetic. Its elegant sunburst dial, robust 8305B movement, and dolphin caseback make it a desirable piece for enthusiasts who appreciate honest, well-cared-for examples. History Introduced in the 1960s, the Seikomatic line was positioned as a premium automatic offering, featuring high jewel counts and refined aesthetics. The R designation often denoted a refined or revised iteration of the caliber, bringing enhanced reliability to the Diashock-equipped movements. The distinctive dolphin caseback was utilized by Seiko during this era to signify enhanced water resistance, blending elegant dress watch proportions with practical, everyday durability. Payment and Shipping Payment must be completed within 1–3 days after purchase. Your watch will be professionally and very securely packaged, and shipped with tracking and insurance for your peace of mind. We ship via fast express service, with typical delivery in 1–4 business days (destination dependent). Please review all photos carefully before bidding. We strive to photograph each watch from multiple angles for the most accurate representation. The photos form an important part of the description. As with all vintage watches, water resistance is not guaranteed. The watch will be delivered in fully functional, working condition. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: SEI-SJX-0005