Seiko Cal. 5643 - 866

The Seiko 5643-866 represents an important milestone in Seiko's 1969 lineup. It features a Black dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-81dcb770e59a]

Also known as: Golden Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1969

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