Seiko Cal. 4561 - 638

This Spring Drive model from 1979 features a 38mm Two-Tone case. Powered by the 4561 caliber with 28j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-bde3c0644663]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

28j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1979

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