Seiko Mechanical Stopwatch – Seikosha – Manual Wind – Mid 20th Century This vintage mechanical stopwatch was produced by Seikosha, the historic manufacturing division that forms the foundation of today’s Seiko Holdings. Established in 1892, Seikosha was conceived as a fully vertically integrated watch manufacturer, handling everything from component production to final assembly. This philosophy laid the technological groundwork for Seiko’s later global reputation in precision timekeeping. The origin of Seiko’s timing technology From its earliest years, Seikosha focused on precision instruments rather than decorative timepieces alone. The accumulated expertise in gear production, escapement design, and durability directly influenced the development of highly accurate mechanical stopwatches, positioning Seikosha as a pioneer in professional time measurement in Japan. Contribution to international sports timing Stopwatches developed by Seikosha and its successor, Seiko, were adopted as official timing instruments at numerous international sporting events. Most notably, at the 1964 Tokyo Olympic Games, Seiko stopwatches were selected as the official timing devices. Their accuracy and reliability impressed the world and played a decisive role in establishing Japan as a global leader in precision instruments. Technical innovation and mechanical heritage During the 1960s, Seikosha introduced advanced mechanisms such as improved clutch systems designed to reduce hand jump, hand flutter, and shock-related timing errors. These innovations demonstrate that Seikosha stopwatches were not merely tools, but instruments that actively shaped the history of sports timing and mechanical measurement. A collector’s piece today Early hand-wound Seikosha stopwatches are now regarded as highly collectible vintage instruments, valued for their historical importance, mechanical integrity, and connection to Seiko’s formative years. This piece represents that lineage clearly, both in design and construction. Condition and specifications Brand: Seiko Manufacturer: Seikosha Type: Mechanical stopwatch Movement: Manual wind Case material: Stainless steel Case diameter: 45 mm Weight: approx. 60 g Period: Mid 20th century Condition: Good – visible signs of wear The stopwatch is currently running, however, due to its age, it is offered as a collector’s vintage timepiece. Accuracy, long-term stability, and suitability for professional or competitive timing use are not guaranteed. The stopwatch will be carefully packed and shipped with tracking to ensure safe delivery.