Seiko Cal. 6645 - 903

The Seiko 6645-903 represents an important milestone in Seiko's 1971 lineup. The Fixed bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-01d2b24de161]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Green

Jewels

33j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1971

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