Seiko Cal. 4520 - 957

Released in 1967, the Cal. 4520 with design code 957 was part of Seiko's domestic market collection. With its 22mm lug width and 14.2mm profile, it sits comfortably on most wrists. [seikata-wm-ec90576add2b]

Also known as: Sumo, Helmet

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1967

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