Seiko Cal. 6643 - 763

The 6643-763 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6643 caliber with 31j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-aa849679148e]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

38mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

White

Jewels

31j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1980

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