Seiko Cal. 4428 - 320

Seiko 4428-320

The 4428-320 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4428 caliber with 30j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-9bace85fa0aa]

Also known as: Bellmatic, Arnie

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
41mm
Case Thickness
15.9mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
50m
Dial Color
Green
Jewels
30j
Frequency
36,000 bph
Power Reserve
37 hours
Year
1982

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