Seiko Cal. 6156 - 531

This Hand-Winding model from 1981 features a 37mm Two-Tone case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-02e3cd343fd0]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

31j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1981

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