Seiko Cal. 6646 - 733

The Seiko 6646-733 represents an important milestone in Seiko's 1966 lineup. The Inner Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-7019f2b1168a]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

27j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1966

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