Seiko Cal. 3821 - 257

The Seiko 3821-257 represents an important milestone in Seiko's 1972 lineup. Powered by the 3821 caliber with 28j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-b10c9992584e]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1972

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