Seiko Cal. 5664 - 850

The Seiko 5664-850 represents an important milestone in Seiko's 1969 lineup. Powered by the 5664 caliber with 31j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-87fb6b3d8583]

Also known as: Sumo, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1969

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