Seiko Cal. 4440 - 637

Seiko 4440-637

This Hand-Winding model from 1973 features a 35mm Two-Tone case. Powered by the 4440 caliber with 33j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-53c793a9f3d2]

Also known as: Turtle, Samurai

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
35mm
Case Thickness
8.9mm
Lug Width
21mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
100m
Dial Color
Cream
Jewels
33j
Frequency
21,600 bph
Power Reserve
60 hours
Year
1973

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