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You are here: Home / Families / Daini Seikosha 45 Stream

Daini Seikosha 45 Stream

Last Update: February 2, 2020

BRANDS: Daini Seikosha, Grand Seiko, Seiko

Production: 1968 – 1974
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s
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The “45 stream” was a series of hand-winding Hi-Beat (36,000 A/h) movements produced by Daini Seikosha for Seiko watches (including King Seiko and Grand Seiko) between 1968 and 1974.

Seiko 45 Stream Overview

Throughout the 1960s, Seiko had two internal operations competing for watchmaking supremacy. Suwa Seikosha, formed in 1959, focused on high-end men’s watches and originated the Grand Seiko line. Daini Seikosha, the historic watchmaking operation for Hattori Seikosha, developed the alternate King Seiko line before creating the famous Grand Seiko Style with the 44GS of 1967.

In 1968, both Suwa and Daini produced a Hi-Beat movement fit for a Grand Seiko watch. The Suwa 6100 stream was an automatic while the Daini 4500 was hand-wound. Both were used in Grand Seiko models until the decline of mechanical watches in that line around 1975.

The Daini Seikosha 4500 stream replaced the respected but slow-beating 4400 stream in King Seiko and Grand Seiko models. The move from 5 Hz to 10 Hz had been a singular technical challenge for Daini, both from a design and metallurgical standpoint. But the movement featured other technical advances as well, including an “instant” date change mechanism.

Compared to the Suwa automatic movement, Daini’s 4500 stream was more elegant in design, with a classic hand-winding look and full balance bridge. It was also notably thinner, giving Daini’s watches a desirable design differentiator.

CalibreProductionApplicationDateNotes
Cal. 45001968-1972King SeikoNo
Cal. 45021968-1973King SeikoYes
Cal. 4520A1968-1974Grand SeikoNoSome tuned for Observatory Chronometer use
Cal. 4522A1968-1972Grand SeikoYes
Cal. 4580 VFA1969-1973Grand SeikoNoVery Fine Adjustment, limited production
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Calibre Start Year End Year Jewels Diameter (mm) Height (mm) Complications
Seiko 4500 1968 1972
Seiko 4502 1968 1973 Date, Instant Date Change
Seiko 4520 1968 1974 25 3.5
Seiko 4522 1968 1972 Date, Instant Date Change
Seiko 4580 1969 1973 25

Seiko 4500

Seiko 4502

Seiko 4520

Seiko 4522

Seiko 4580

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