Seiko Cal. 0731 - 939

The Seiko 0731-939 represents an important milestone in Seiko's 1983 lineup. It features a White dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-f26efd255b25]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

White

Jewels

29j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1983

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