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In 1974, Casio released their first digital wristwatch, called the CASIOTRON. It was the first wristwatch in the world to include an automatic calendar function. In 1977, they released a retro-futuristic wristwatch, called the F100. The watch was one of the first wristwatches in the world to be made primarily out of resin, making it very light compared to other companies' heavy metal-made watches and enabling future Casio watches to enter mass production more easily. In 1989, Casio released another important wristwatch; the F-91W, the most sold wristwatch in the world with an annual production of 3 million units.

In 1974, Casio released their first digital wristwatch, called the CASIOTRON. It was the first wristwatch in the world to include an automatic calendar function. In 1977, they released a retro-futuristic wristwatch, called the F100. The watch was one of the first wristwatches in the world to be made primarily out of resin, making it very light compared to other companies' heavy metal-made watches and enabling future Casio watches to enter mass production more easily. In 1989, Casio released another important wristwatch; the F-91W, the most sold wristwatch in the world with an annual production of 3 million units.