Seiko Cal. 4438 - 699

The 4438-699 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4438 caliber with 31j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-85f41c4f7c91]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1980

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