Seiko Cal. 4428 - 731

This Quartz model from 1972 features a 34mm Two-Tone case. Powered by the 4428 caliber with 31j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-788e05b4bc58]

Also known as: Monster, Sea Horse

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1972

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