Seiko Cal. 4438 - 553

The Seiko 4438-553 represents an important milestone in Seiko's 1991 lineup. Powered by the 4438 caliber with 32j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-9837ea802f86]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1991

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