Seiko Cal. 6643 - 723

This Spring Drive model from 1993 features a 37mm Gold-Plated case. Powered by the 6643 caliber with 26j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-75d44c13a48a]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1993

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