Seiko Cal. 4420 - 242

Seiko 4420-242

This Hand-Winding model from 1978 features a 35mm Hardlex-Coated Steel case. Powered by the 4420 caliber with 19j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-bdc9f14a34c1]

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
8.9mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
200m
Dial Color
Black
Jewels
19j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1978

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