Seiko Cal. 4521 - 566

The Seiko 4521-566 represents an important milestone in Seiko's 1996 lineup. Powered by the 4521 caliber with 35j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-b6a33c6180bb]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1996

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