This Seiko Business-A, produced at Suwa factory in September 1967, is an exceptional and rare model within the series. It features the cross-line dial, the uncommon side-logo SEIKO emblem, and the highly sought-after one-piece waterproof case. Such a combination is rarely seen, making this Business-A stand out even among collectors. Inside beats the automatic Cal. 8306 with 30 jewels, representing Seiko’s technical ambition of the 1960s to produce durable, high-grade timepieces for professionals. The silver dial shows a light and even patina, giving it a warm vintage character while keeping the applied indexes and hands in attractive condition. Importantly, the dial is fully original and has not been refinished. The day display is English only (no Kanji option), paired with a quickset date function for practical use. The watch comes with a Seiko stainless steel bracelet of the period, though not the exact bracelet originally paired with the Business-A, it suits the piece well and maintains the authentic vintage aesthetic. Case size is approx. 34.5 mm, with an 18 mm lug width, offering a classic yet wearable presence. Condition: – Very good vintage condition with natural signs of age. – Quickset mechanism works correctly. – Bracelet shows stretch but remains functional. – As with all vintage watches, water resistance is not guaranteed, despite the original one-piece waterproof case construction. This watch perfectly captures the innovative spirit of Seiko during Japan’s postwar period of rapid economic growth — robust, reliable, and stylish, designed for the new business generation. A highly collectible piece of Japanese watchmaking history.