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Seiko’s most precise watch of its day, designed to compete with global watchmakers through a balance of high performance and simplicity in manufacturing and repair. The larger φ26 mm of movement represented a fundamental principles of watch design. This unrivaled watch won accuracy competitions in Japan, overtook a Swiss-made product, and took first ranking in a 1957 competition by the American Watchmakers-Clockmakers Institute (Japanese branch). This innovative product dispelled the stereotype of the “the cheap” Japanese timepiece.