Seiko Cal. 5631 - 890

The 5631-890 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5631 caliber with 19j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-1b3dacd73ad3]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

13.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1991

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