Seiko Cal. 5663 - 721

The 5663-721 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5663 caliber with 29j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-12f00add1fa4]

Also known as: Monster, Navigator

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

29j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1990

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