Seiko Cal. 4436 - 441

This Spring Drive model from 1972 features a 37mm Stainless Steel case. Powered by the 4436 caliber with 27j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-df490e105e35]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

27j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1972

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