Seiko Cal. 6643 - 180

The Seiko 6643-180 represents an important milestone in Seiko's 1970 lineup. It features a White dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-81c3607c011f]

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1970

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