Seiko Cal. 6640 - 288

The Seiko 6640-288 represents an important milestone in Seiko's 1977 lineup. It features a Cream dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-e92684efbe5d]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1977

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