Seiko Cal. 3818 - 637

The Seiko 3818-637 represents an important milestone in Seiko's 1971 lineup. It features a Champagne dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-6f762f08bb43]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

14.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Champagne

Jewels

34j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1971

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