Seiko Cal. 4520 - 975

This Spring Drive model from 1971 features a 44mm Two-Tone case. Powered by the 4520 caliber with 22j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-f5f6e8c5a9bd]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1971

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