Seiko Grand Seiko 56GS 5645-7010 (1971)

Now available at auction from Second Vintage This sought-after vintage Grand Seiko 56GS presents a compelling opportunity for collectors, distinguished by its cap gold case and a beautifully preserved gold GS medallion on the caseback. Driven by the high-beat 5645A automatic movement adjusted to five positions and temperature, this timepiece represents the final era of classic mechanical production before the quartz revolution. Brand: Seiko Model: Seiko GS Hi-Beat Reference Number: 5645-7010 Serial Number: 123365 Movement: Automatic, Caliber 5645A, 25 Jewels Dial: Clean white and cream with applied indices Case Size: 36 mm (excluding the crown) Case Material: Cap Gold, Stainless Steel caseback Production Year: 1971 Condition: Good vintage condition. Timegrapher: +11+15s/day, performing remarkably well. Dial and Hands The watch features a clean white and cream dial that remains highly attractive and well-preserved. Under macro inspection, very minor and scattered micro-spotting is visible, adding honest character to the surface. The applied indices and logos are crisp, while all printing is sharp and fully intact. The dauphine hands, detailed with black central stripes, are original and in excellent condition for their age, showing only minor surface oxidation and light wear under close examination. Case and Crystal The cap gold case presents honest vintage wear while preserving its overall geometry. Moderate scratches and handling wear are present throughout, alongside some dings and edge wear visible on the lugs and case flanks. The thin integrated bezel shows scratches and wear consistent with the rest of the case. Turning the watch over reveals a stainless steel caseback featuring a remarkably well-preserved gold GS medallion. The original crown is signed with the GS logo and its knurling shows normal wear. The flat crystal is clear with no major scratches, chips, or cracks visible, displaying only some minor dust or superficial marks. Movement Inside beats the Caliber 5645A, a 25-jewel automatic movement that operates at a hi-beat frequency of 28,800 beats per hour and is adjusted to five positions and temperature. The movement appears clean with no obvious signs of corrosion or heavy oxidation. Both the rotor and bridges show crisp finishing and clear engravings. +11+15s/day. Exhibiting remarkable accuracy and consistency, performing brilliantly for a vintage timepiece. Strap The watch is fitted with a black leather strap featuring contrast stitching. The strap shows light wear and creasing from use, serving as a complementary pairing for the wrist. Condition Good vintage condition. The cap gold case displays honest wear, including moderate scratches, dings, and edge wear on the lugs and flanks, yet retains its structural geometry and a well-preserved GS caseback medallion. The attractive dial is well-preserved, showing only minor, scattered micro-spotting under macro inspection, complemented by crisp applied indices. The original hands exhibit minor surface oxidation. The crystal remains clear with only superficial marks. Supported by the recorded timegrapher result, the movement is performing very strongly. Dimensions The case measures 36 mm (excluding the crown). Remarks This Grand Seiko offers an excellent opportunity to acquire a highly respected 56GS design. With its hi-beat movement, preserved gold medallion, and sharp case geometry, it is a compelling choice for enthusiasts of classic Japanese watchmaking. History The 56GS series holds a significant place in horological history, introduced in late 1970. These models represent the final mechanical Grand Seiko timepieces produced before the brand temporarily ceased mechanical production due to the Quartz Crisis. The case design of the 5645-7010 follows Taro Tanaka's famous Grammar of Design principles, establishing a visual language that remains highly respected among collectors today. Payment and Shipping Payment must be completed within 1–3 days after purchase. Your watch will be professionally and securely packaged, then shipped with tracking and insurance for your peace of mind. We use fast express shipping, with typical delivery within 1–4 business days, depending on the destination. Please note that vintage watches may show minor signs of wear, aging, or imperfections, which are considered normal for watches of this age. We kindly ask you to review all photos carefully before bidding. We photograph each watch from multiple angles to provide the most accurate representation possible, and the photos form an important part of the description. The timegrapher assessment if provided is seen as an indication of the movement’s condition under fully wound testing conditions. As with all vintage watches, results may vary in daily use. If you have any concerns regarding functionality or defects after delivery, please contact us within 3 days of receiving the watch so we can assist you. As with all used watches, water resistance is not guaranteed. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: SEI-GHX-0002