Seiko Cal. 4437 - 426

The 4437-426 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4437 caliber with 34j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-0792fefd2a71]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

12.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1981

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