Seiko Cal. 6643 - 400

The Seiko 6643-400 represents an important milestone in Seiko's 1967 lineup. Powered by the 6643 caliber with 21j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-59be7a8b1dcc]

Also known as: Panda, Rally

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

14.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1967

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