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You are here: Home / Families / Daini Seikosha 51 Stream

Daini Seikosha 51 Stream

Last Update: February 6, 2020

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BRANDS: Daini Seikosha, Seiko

Production: 1967 – 1971
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
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The Cal. 51 series is a short-lived family of automatic movements produced by Daini Seikosha. It was used in the Seiko Five, Seikomatic P, and Presmatic watch lines from 1967 until 1971. It was phased out in favor of the more advanced Daini 52 stream starting in 1970.

The first automatic movement designed by Daini Seikosha, the 51 stream has many unusual features. Most notable was the quickset date, which was operated by a push button in the crown. This gave the “Presmatic” its name and was common to all movements in the series. The design was also generous with jewels, ranging from 23 to 33.

It lacked some signature Seiko features as well. The day wheel was mono-lingual, unlike the follow-on 52 stream. And it used a conventional reverser for the automatic winding rotor rather than Seiko’s Magic Lever system.

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