Seiko Cal. 6644 - 649

The Seiko 6644-649 represents an important milestone in Seiko's 1968 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-b29bd706d68b]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

White

Jewels

29j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1968

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