Seiko Cal. 3870 - 557

The Seiko 3870-557 represents an important milestone in Seiko's 1975 lineup. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-2be641b65009]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Cream

Jewels

19j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1975

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