Seiko Cal. 4437 - 766

This Hand-Winding model from 1975 features a 39mm Stainless Steel case. Powered by the 4437 caliber with 30j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-a665e4834558]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1975

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