Seiko Cal. 3857 - 633

The Seiko 3857-633 represents an important milestone in Seiko's 1970 lineup. With its 19mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-a3fccc72eb9b]

Also known as: Monster, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1970

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