Seiko Cal. 5663 - 721

Seiko 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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