Seiko Cal. 4521 - 970

The Seiko 4521-970 represents an important milestone in Seiko's 1972 lineup. The Coin-Edge bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-4751b4cb4fdb]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1972

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