Introduction: A remarkable specimen from the dawn of high-end Japanese quartz technology: the Seiko 0843-8040. This model is renowned for its substantial, sharp-edged stainless steel case that embodies the "Grammar of Design" ethos. The deep black (with hints of dark navy) dial offers a stunning contrast against the polished indices and hands, providing a look of absolute authority and timeless luxury. A robust and sophisticated vintage piece that commands attention on the wrist. Condition Report: Status: [ Working ] (Fitted with a brand-new battery; running perfectly with Day-Date function working as intended.) Cosmetic: Rank A (Very Good). The watch is in excellent vintage condition. The case retains its sharp architectural lines, and the crystal is remarkably clear for its age, showing only light signs of previous ownership. Specs: Case Size: 39.3mm (1.54 inch) excluding crown Wrist Size: Max approx. 17.0cm (6.69 inch) Material: Stainless Steel Movement: High-Grade 0843 Quartz (Made in Japan) Features: Day-Date Calendar (English/Japanese Kanji) Maintenance: This timepiece has been professionally cleaned and sanitized. It has received a fresh battery replacement, ensuring it remains a reliable daily companion. Accessories: None (Watch only) Internal Ref: 25-714