Seiko Cal. 5664 - 256

The Seiko 5664-256 represents an important milestone in Seiko's 1990 lineup. Powered by the 5664 caliber with 30j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-2b66ea60accb]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1990

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