Seiko Cal. 4428 - 875

This Spring Drive model from 1971 features a 40mm Stainless Steel case. Powered by the 4428 caliber with 31j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-e1fcd67abe05]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Burgundy

Jewels

31j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1971

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