Seiko traces its origins to December 1881, when 21-year-old Kintarō Hattori opened a watch sales and repair shop in Tokyo. In 1892 Hattori established the Seikosha manufacturing facility, producing Japan's first pocket watch in 1895 and the first Seiko-branded wristwatch in 1924. Seiko achieved a defining moment in global horology on 25 December 1969 with the commercial release of the Astron — the world's first quartz wristwatch — preempting Swiss competition and triggering the quartz revolution that reshaped the entire industry.

Today the Seiko Group Corporation (renamed from Seiko Holdings in 2022) encompasses Grand Seiko, Credor, Orient, and Pulsar. Seiko is one of the most vertically integrated watchmakers in the world, producing movements, cases, dials, crystals, and straps in-house. Its caliber range spans basic quartz to the uniquely Japanese Spring Drive glide-spring mechanism and hi-beat automatics running at 36,000 A/h. The documented caliber series (11A, 1100A, 2206A, 2220A, 2501A) represent the manual and automatic mechanical families of the 1960s–1970s.

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Manufacturer Movement
Seiko Manual 12.97 mm x 15.23 mm
Seiko Manual 23.69 mm
Seiko Manual 27.4 mm
Seiko Manual 23.69 mm
Seiko Manual 23.69 mm
Seiko Manual 25.94 mm
Seiko Quartz 28.2 mm
Seiko Automatic 19.74 mm
Seiko Manual 17.48 mm
Seiko Manual 17.48 mm
Seiko Manual
Seiko Manual 10.72 mm
Seiko Manual 15.23 mm
Seiko Manual 15.23 mm
Seiko Manual 15.23 mm
Seiko Automatic 25.94 mm
Seiko Manual 23.69 mm
Seiko Manual 19.74 mm
Seiko Manual 15.23 mm
Seiko Manual 10.72 mm
Seiko Automatic 25.94 mm
Seiko Automatic 25.94 mm
Seiko Automatic 25.94 mm
Seiko Automatic 25.94 mm
Seiko Autoquartz / Kinetic
Seiko Autoquartz / Kinetic
Seiko Manual 15.79 mm
Seiko Automatic
Seiko Automatic 25.94 mm
Seiko Automatic