Seiko Cal. 6640 - 389

The Seiko 6640-389 represents an important milestone in Seiko's 1968 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-2c272bd334a0]

Also known as: Arnie

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1968

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