Seiko Cal. 6644 - 363

The Seiko 6644-363 represents an important milestone in Seiko's 1968 lineup. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-61eb3c0b6739]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1968

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