Seiko Cal. 5621 - 728

The Seiko 5621-728 represents an important milestone in Seiko's 1968 lineup. Powered by the 5621 caliber with 30j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-9b897fb2db57]

Also known as: Tuna, Sea Horse

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

White

Jewels

30j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1968

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