Seiko Cal. 3871 - 531

The Seiko 3871-531 represents an important milestone in Seiko's 1978 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-42b073b05985]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

12.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1978

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