Seiko Cal. 5666 - 850

The Seiko 5666-850 represents an important milestone in Seiko's 1981 lineup. Powered by the 5666 caliber with 25j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-9da81fe60a71]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1981

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