Seiko Cal. 4430 - 528

The 4430-528 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4430 caliber with 26j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-7dd473b8b8e8]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

13.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Silver

Jewels

26j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1978

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