Seiko Cal. 6638 - 277

The Seiko 6638-277 represents an important milestone in Seiko's 1970 lineup. Powered by the 6638 caliber with 35j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-896e5fb125ac]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

35mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1970

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