{"product_id":"seiko-mens-octagon-quartz-watch-5931-5350-28-1mm-x-30-7mm-5-5mm-thin-1980s","title":"SEIKO Mens Octagon Quartz Watch 5931-5350 28.1mm x 30.7mm 5.5mm Thin 1980s","description":"\u003cp data-auth-badge=\"2026-07\"\u003e\u003cstrong\u003e✓ Authenticated by professional third-party experts — 100% genuine, money-back guaranteed.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cb\u003eVintage Seiko Octagon Men's Watch 5931-5350\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e This elegant vintage analog quartz dress watch, manufactured around the 1980s, features a distinctive octagonal case. It houses the acclaimed Cal. 5931 movement, celebrated for its innovative \"adaptive drive control\" which allowed for a slim profile and extended lifespan. A true piece of Seiko's quartz heritage.\u003cbr\u003e\u003cbr\u003e The watch case measures approximately 30.7mm (vertical) x 28.1mm (horizontal) with a slender thickness of about 5.5mm. The lug width is approximately 17.4mm. Its compact size makes it a refined choice.\u003cbr\u003e\u003cbr\u003e It is in good working order, with a new battery recently installed and the crown operating normally. The original strap has been replaced with a new, quality aftermarket band due to age. While the exterior shows minor scuffs typical for a vintage item, it maintains a generally clean appearance.\u003cbr\u003e\u003cbr\u003e This hard-to-find vintage Seiko offers a blend of classic design and pioneering quartz technology. As a pre-owned item, please anticipate slight imperfections consistent with its age, adding to its unique vintage charm.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eNo additional fees such as import taxes or shipping costs will be incurred!\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eFeedback Policy\u003cbr\u003eI provide timely customer support to all purchasers. I will respond to your inquiry within 24 hours. My working hours are from 10:00 to 20:00 Japan time.\u003cbr\u003eOnce you have received your item please make feedback for me as this will let me know that you have received your item.\u003cbr\u003eIn case of damage please be sure to take pictures of the following items and send them to me:\u003cbr\u003ePhotograph of the entire item \/ Photograph of the damaged part \/ A photo of the condition of the cushioning material in the package \/ A photo of the condition of the cardboard box it arrived in\u003cbr\u003e\u003cbr\u003eStatement on Legal Compliance and Quality Assurance for the Sale of Used Goods\u003cbr\u003eAt my store, all products are directly sourced from trusted consumers or authorized sellers. This ensures the provenance and quality of every item I offer. I strictly adhere to the following practices:\u003cbr\u003eLegal Compliance: The products I handle comply with the Lanham Act, Common Law infringement, Unfair Competition Prevention Laws, and equivalent laws in other countries. This is because I thoroughly verify the origin and rights of each product, and seek legal advice when necessary.\u003cbr\u003eQuality Assurance: I rigorously clean and disinfect all items before listing them for sale and conduct quality control checks. This guarantees that I provide safe, high-quality products to my customers.\u003cbr\u003eTransparency and Responsibility: If it's brought to my attention that any of my listings may violate the aforementioned laws, I will promptly investigate and take the necessary actions. Moreover, I commit to promptly correcting any misinformation and maintaining transparency.\u003cbr\u003eHandling of Misinformation: While I strive for accuracy, there may be instances of unintentional misinformation due to human error. If you encounter such issues, please contact me directly. I promise to address your concerns with courtesy and professionalism.\u003cbr\u003eCustomer Engagement: I always respond to customer feedback and inquiries with courtesy and promptness. I am committed to providing an enjoyable and secure shopping experience for all my customers. If you have any questions or concerns about my products, please feel free to reach out to me. If there is any item you are looking for, please feel free to contact me. Even if the item is not listed in my store, I will do my very best to find it for you.","brand":"Plum Luxury Watches","offers":[{"title":"Default Title","offer_id":50503179239639,"sku":"22954469415watch0830","price":198.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/5392\/5591\/files\/22954469415watch0830-1.jpg?v=1790002333","url":"https:\/\/plum-laxury.com\/products\/seiko-mens-octagon-quartz-watch-5931-5350-28-1mm-x-30-7mm-5-5mm-thin-1980s","provider":"Plum Luxury Watches","version":"1.0","type":"link"}