Seiko Cal. 6630 - 728

The Seiko 6630-728 represents an important milestone in Seiko's 1976 lineup. Powered by the 6630 caliber with 34j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-d699e816e98a]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

34j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1976

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