Seiko Cal. 4520 - 958

This Spring Drive model from 1970 features a 37mm Two-Tone case. Powered by the 4520 caliber with 33j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-c4106dd82ae1]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1970

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