Seiko Cal. 6647 - 400

The 6647-400 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-19dce53bd8c7]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1984

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