Seiko Cal. 3857 - 537

This Automatic model from 1978 features a 46mm Two-Tone case. Powered by the 3857 caliber with 17j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-d49214707ff5]

Also known as: Monster, Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Navy

Jewels

17j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1978

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