Seiko Cal. 3857 - 631

This Spring Drive model from 1999 features a 36mm Two-Tone case. Powered by the 3857 caliber with 22j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-58220195d147]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

13.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Silver

Jewels

22j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1999

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