Seiko Cal. 3871 - 671

The Seiko 3871-671 represents an important milestone in Seiko's 1975 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 80m of water resistance. [seikata-wm-31225b7e0bc4]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1975

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