Seiko Cal. 6648 - 369

The Seiko 6648-369 represents an important milestone in Seiko's 1987 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-d5ad8417cdd5]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1987

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