History of Seiko 3602(No. 5) - Riquartz

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History
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- 1 (2024-12-01 (Sun) 17:55:52)
- 2 (2024-12-01 (Sun) 19:29:34)
- 3 (2024-12-02 (Mon) 11:45:35)
- 4 (2024-12-08 (Sun) 16:52:28)
- 5 (2024-12-09 (Mon) 17:11:16)
- 6 (2025-06-24 (Tue) 17:49:08)

https://www.plus9time.com/monozukuri-2018

https://electricwatchprototypes.com/article_draft/

Very short lived predecessor to the 39 Series, rectangular with wig-wag motor instead of stepping motor, and 2x batteries in series. Very rare and debatably not even sold to the public.

Launched Dec 1970
Accuracy 0.1s per day or 3s per month
Battery 2x 303
Battery life 3 years

Ref	Case	Dial	Notes
3602-????	Stainless steel		Yen215.000 inc bracelet
3602-????	Stainless steel	Suwa logo

Seiko Sales brochures†

Note date indicates 2nd
Seconds hand on 43

Seiko museum†

Note Daini logo
Leather strap

Seiko Monozukuri Museum†

Date indicates 22

Museum of Japanese Watches book†

Illustrated in Museum of Japanese Watches book
"Seiko Museum Collection"
Appears to be two different watches from the front, plus caseback and movement shots.
Note Daini logo on dial and caseback
Date indicates 20th and 24th
Seconds hand on

Movement no. 000241†

Illustrated in Seiko Sales brochure Jan 1971
Signed "Seiko, 10J, 3602A, Japan, 000241"

Movement no. unknown [No 000130?]†

Illustrated in Museum of Japanese Watches book
Signed "Seiko, 10J, 3602A, Japan, 000???" possibly 000130?

Movement no. unknown†

Signed "Daini Seikosha" with text other way up to 000241