Seiko Cal. 4557 - 728

This Spring Drive model from 1981 features a 46mm Two-Tone case. With its 22mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-f449c711931a]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1981

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