Seiko Cal. 5640 - 638

The Seiko 5640-638 represents an important milestone in Seiko's 1982 lineup. It features a Black dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-6bfa89f2001f]

Also known as: Goldfeather

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

39mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1982

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