Seiko Cal. 5630 - 771

The 5630-771 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5630 caliber with 20j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-dd14f90ee0e7]

Also known as: Monster, Sumo

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1987

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