Seiko Cal. 4437 - 148

The Seiko 4437-148 represents an important milestone in Seiko's 1988 lineup. Powered by the 4437 caliber with 33j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-9254c95ee2ee]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1988

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