Seiko Cal. 3831 - 721

The 3831-721 is a sought-after Quartz piece from Seiko's golden era. Powered by the 3831 caliber with 28j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-30e5713458c7]

Also known as: Monster, Rally

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1976

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