Seiko Cal. 5663 - 370

Seiko 5663-370

This Automatic model from 1973 features a 38mm Two-Tone case. Powered by the 5663 caliber with 21j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-8f0671a16bc5]

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
38mm
Case Thickness
13.5mm
Lug Width
21mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
80m
Dial Color
Green
Jewels
21j
Frequency
28,800 bph
Power Reserve
39 hours
Year
1973

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