Seiko Cal. 3878 - 637

The Seiko 3878-637 represents an important milestone in Seiko's 1972 lineup. It features a Green dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-e9ee21c7f28f]

Also known as: Samurai, Monster

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

30j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1972

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