Seiko Cal. 3857 - 642

This Automatic model from 1967 features a 36mm Hardlex-Coated Steel case. Powered by the 3857 caliber with 35j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-7f8d8fe0b8b6]

Also known as: Rally, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1967

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