Seiko Cal. 4520 - 231

The Seiko 4520-231 represents an important milestone in Seiko's 1989 lineup. Powered by the 4520 caliber with 34j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-fcd19ad78676]

Also known as: Sumo, Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Burgundy

Jewels

34j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1989

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