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The Seiko 5 series was introduced by Seiko in 1963 under the name "Seiko Sportsmatic 5". This model is regarded as one of the earliest examples of automatic mechanical watches with day and date displays in Japan. The "5" in the series denotes five key features: an automatic movement, day and date display, water resistance, a protected crown position, and a durable case design.In the late 1960s, Seiko expanded its product range by launching the sub-series "Seiko 5 Sports", which emphasized greate

What Is an Hourglass?An hourglass is an ancient and simple device used to measure the passage of time. It consists of two glass bulbs connected by a narrow tube, each containing fine sand. The time elapsed is measured as the sand flows from the upper bulb to the lower one. The complete transfer of sand from the top bulb to the bottom bulb represents a specific time interval, typically limited to a few minutes.How Does an Hourglass Work?The fundamental principle of the hourglass is gravity. The s