Seiko Cal. 6640 - 487

The Seiko 6640-487 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-6c319f1b7bea]

Also known as: Samurai, Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1971

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