Seiko Cal. 5257 - 635

The Seiko 5257-635 represents an important milestone in Seiko's 1973 lineup. With its 21mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-0f11fe9df1f6]

Also known as: Helmet, Flighty

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

13.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1973

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