Seiko Cal. 6639 - 363

The Seiko 6639-363 represents an important milestone in Seiko's 1990 lineup. It features a Black dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-a5ed4b5e13a8]

Also known as: Goldfeather

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1990

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