Seiko Cal. 6391 - 623

The Seiko 6391-623 represents an important milestone in Seiko's 1971 lineup. It features a Black dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-d53ba1a2a447]

Also known as: UFO, Crown

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

14.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Black

Jewels

21j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1971

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