Seiko Cal. 4521 - 371

The Seiko 4521-371 represents an important milestone in Seiko's 1977 lineup. With its 19mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-53e0cb5054c0]

Also known as: Sumo, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1977

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