Seiko Cal. 3870 - 366

The Seiko 3870-366 represents an important milestone in Seiko's 1974 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 160m of water resistance. [seikata-wm-209b66a6d8b4]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1974

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