Seiko Cal. 6639 - 471

The Seiko 6639-471 represents an important milestone in Seiko's 1976 lineup. It features a Black dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-7e4a7b91b523]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

36mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1976

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