Seiko Cal. 6643 - 630

The Seiko 6643-630 represents an important milestone in Seiko's 1987 lineup. It features a White dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-424724b4eb70]

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

White

Jewels

18j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1987

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