Seiko Cal. 6391 - 656

The Seiko 6391-656 represents an important milestone in Seiko's 1977 lineup. It features a Black dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-b8972a1a8296]

Also known as: Silverwave, Bellmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1977

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