Seiko Cal. 4520 - 920

Released in 1971, the Cal. 4520 with design code 920 was part of Seiko's domestic market collection. Powered by the 4520 caliber with 20j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-db96ace1a2d6]

Also known as: Bullhead, Emperor

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

130m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1971

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