Seiko Cal. 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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