Seiko Cal. 6638 - 786

The Seiko 6638-786 represents an important milestone in Seiko's 1969 lineup. Powered by the 6638 caliber with 31j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-42e87bbc8870]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1969

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