Seiko Cal. 6643 - 635

The 6643-635 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6643 caliber with 24j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-c67060aac3bc]

Also known as: Golden Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

43mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Navy

Jewels

24j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1993

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