Management Number 0604 0531 3542 Y 473 48 Born in the early 1960s — an era when Japanese watchmaking began its challenge to the world — the Seiko-Matic 15031 is a celebrated vintage automatic timepiece. It is powered by Caliber 603, one of Seiko's earliest full-fledged automatic movements, and features the 20-jewel construction with Diashock anti-shock protection, which was considered cutting-edge technology at the time. This watch is known as a symbolic piece from the period when Seiko proposed the era of "no hand-winding required." Currently running. The case diameter is approximately 36mm (excluding crown), lug width approximately 19mm, and thickness approximately 10mm — a refined size that remains comfortable for modern wear. This individual piece carries the unique character and presence that only more than 60 years of history can bring, making it an attractive addition to any Japanese vintage watch collection or Seiko collection. Minor scratches and signs of use consistent with its age are present, testament to the time it has kept. Brand: SEIKO Gender: Men's Movement: Automatic Working / Non-working: Working 20 Jewels Lug Width: Approx. 19mm This item is pre-owned and may show signs of use such as scratches, wear, and age-related deterioration. Please refer to the photos for the condition. The watch is confirmed to be running at the time of listing; however, only a short and basic functionality check has been performed. Long-term accuracy and continuous operation have not been tested and are not guaranteed. For quartz watches, the battery level is unknown and replacement may be required after delivery. For mechanical watches, daily accuracy, internal condition, and service history are unknown. Water resistance is not guaranteed. Only the items shown in the photos are included. This item is sold as-is. Please bid with full understanding. We will ship via DHL or FEDEX to arrive within 5 days.