Seiko Cal. 5641 - 816

The Seiko 5641-816 represents an important milestone in Seiko's 1976 lineup. Powered by the 5641 caliber with 24j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-0a9339ba0eff]

Also known as: Tuna, Bellmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

35mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1976

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