Seiko Cal. 6643 - 780

The Seiko 6643-780 represents an important milestone in Seiko's 1995 lineup. Powered by the 6643 caliber with 26j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-5eb290f89fe9]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

26j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1995

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