Seiko Cal. 6381 - 661

The Seiko 6381-661 represents an important milestone in Seiko's 1975 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-285bccaf0935]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1975

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