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Casio
Casio was founded in 1946 in Japan by Tadao Kashio, initially as an electronics company before entering the watch market and launching the Casio F-91W and related G-Shock lines that became defining examples of affordable, highly durable digital watch technology. The G-Shock line, introduced in 1983, was developed by Casio engineer Kikuo Ibe specifically after he accidentally dropped and shattered a mechanical watch, leading him to spend years developing a shock-resistant design that could survive drops, water exposure, and extreme temperature changes. Casio's digital watches became globally ubiquitous specifically due to their combination of extreme affordability and functional reliability, and models like the F-91W achieved a level of worldwide market penetration that made them one of the best-selling individual watch models in history by unit volume. Casio's combination of the G-Shock line's engineering-driven durability breakthrough and its watches' unmatched global affordability and sales volume has made it one of the most commercially significant watch brands in the world by units sold.
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Seiko
Seiko was founded in 1881 in Tokyo by Kintaro Hattori, and the company introduced the Seiko Quartz Astron in December 1969, the world's first commercially produced quartz wristwatch, a technological breakthrough that triggered what the watch industry calls the "quartz crisis," fundamentally reshaping the global watchmaking business. The Astron's introduction of significantly more accurate and affordable quartz movement technology disrupted the traditional Swiss mechanical watch industry so severely that numerous established Swiss watchmakers went out of business or were forced to consolidate during the 1970s and 1980s as quartz watches captured a dominant share of the global market. Seiko has continued producing both quartz and traditional mechanical watches across a wide range of price points, from mass-market affordable models to high-end mechanical watches produced by its Grand Seiko division, reflecting the company's unusually broad range across the entire watchmaking market. Seiko's combination of its industry-transforming quartz watch invention and its sustained broad market presence across both affordable and luxury watchmaking has made it one of the most historically significant watch brands in the industry's modern history.
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