Seiko Holdings Corporation, commonly known as Seiko, is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelries, and optical products. Founded in 1881, it is known for introducing the world's first quartz watch as well as the world's first quartz watch with a chronograph complication.
Seiko produces watches with quartz, kinetic, solar, and mechanical movements of varying prices, ranging from around ¥4,000 (US$45) to ¥50,000,000 (US$554,000). To separate the customer groups, Seiko has created many different brands in Japan and the international market including Lorus, Pulsar, and Alba. Seiko has several lines such as the Seiko 5, luxury "Credor", "Prospex", "Presage", "Velatura" and the "Grand Seiko" series.
|Model||Prospex Tuna Dive|
|Case materials||Stainless steel|
|Case diameter||47 mm|
|Water resistance||20 atm|
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