Seiko Cal. 4438 - 177

The Seiko 4438-177 represents an important milestone in Seiko's 1975 lineup. Powered by the 4438 caliber with 27j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-7579c90dd1fa]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

27j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1975

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