Seiko Cal. 6638 - 916

The Seiko 6638-916 represents an important milestone in Seiko's 1983 lineup. With its 18mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-029baf2ddce9]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1983

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