Seiko Cal. 5631 - 409

The Seiko 5631-409 represents an important milestone in Seiko's 1965 lineup. Powered by the 5631 caliber with 25j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-b1e827ee47e9]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1965

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