Seiko Cal. 6639 - 878

The Seiko 6639-878 represents an important milestone in Seiko's 1975 lineup. It features a Silver dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-577569d47cd5]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1975

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