Seiko Cal. 4420 - 978

Seiko 4420-978

This Hand-Winding model from 1981 features a 37mm Hardlex-Coated Steel case. Powered by the 4420 caliber with 29j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-0ebcac4265a9]

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
15.2mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
130m
Dial Color
Navy
Jewels
29j
Frequency
36,000 bph
Power Reserve
38 hours
Year
1981

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