Seiko Cal. 6643 - 770

The 6643-770 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6643 caliber with 24j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-9c976058bf60]

Also known as: Tuna, Silverwave

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

10.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Cream

Jewels

24j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1992

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