Seiko Seikomatic-R 8346-9010 (1966)

Presented for auction by Second Vintage The Seikomatic-R represents a golden era of Japanese watchmaking, where elegant design met robust engineering. This particular example showcases the classic mid-century aesthetic that collectors admire, featuring a sophisticated silver dial and a beautifully finished automatic movement. The presence of the iconic dolphin caseback further anchors this piece in Seiko's rich history of water-resistant dress watches. Brand: Seiko Model: Seikomatic-R Reference Number: 8346-9010 Serial Number: 6N34469 Movement: Automatic Caliber 8346A, 27 Jewels Dial: Silver sunburst dial with applied indices, showing visible spotting and moisture marks Case Size: 37 mm (excluding the crown) Case Material: Stainless Steel Production Date: November 1966 Condition: Good vintage condition with honest wear and visible dial aging Dial and Hands The silver sunburst dial features applied, multi-faceted rectangular hour markers with black central striping, complemented by matching dauphine hands. The dial displays clear signs of vintage aging, including visible spotting, moisture marks, and staining, particularly noticeable in the upper right quadrant near the 1 and 2 o'clock positions, as well as scattered across the surface. The applied Seiko logo and printed "SEIKOMATIC-R DIASHOCK 27 JEWELS" remain legible. A framed day-date window sits at 3 o'clock, featuring a blue kanji day wheel. Case and Crystal The 37mm stainless steel case retains its classic profile, exhibiting honest signs of wear consistent with its age. The polished surfaces and bezel show various surface scratches and handling marks. The lugs maintain their structural integrity, though the edges have softened slightly over time. The watch is fitted with a domed acrylic crystal that sits proud of the bezel, showing minor surface wear. The screw-down caseback is a highlight, featuring the deeply engraved Seiko dolphin motif and clear factory markings. Movement Powering this timepiece is the Seiko Caliber 8346A automatic movement, clearly stamped on the rotor alongside the 27 jewels designation. The movement displays clean, brushed finishing on the plates and rotor. Performing well within expected vintage tolerances; running strong and steady. The timegrapher result reads -16 to -21 seconds per day. Strap The watch is fitted with a period-appropriate dark brown leather strap featuring a crocodile-grain pattern and matching stitching, secured by a stainless steel tang buckle. Condition This Seikomatic-R is in good vintage condition. The case shows normal wear with scratches throughout, while the dial exhibits significant spotting and moisture-related patina. The movement appears clean and operational, and the caseback engraving remains exceptionally crisp. Dimensions Case Size: 37 mm (excluding the crown) Remarks This Seikomatic-R offers a wonderful opportunity to acquire a robust 1960s Seiko automatic with the highly desirable dolphin caseback. While the dial shows noticeable aging, it remains a charming and highly wearable piece of Japanese horological history. History Introduced in the 1960s, the Seikomatic line was designed to offer reliable, high-quality automatic movements in elegant, water-resistant cases. The "R" designation often indicated a refined movement architecture, and these watches were positioned as premium offerings just below the Grand Seiko and King Seiko lines. The distinctive dolphin caseback became a beloved symbol of Seiko's advancements in water resistance during this era. / Second Vintage SKU: SEI-MDJ-0004