Seiko Cal. 6640 - 185

The Seiko 6640-185 represents an important milestone in Seiko's 1977 lineup. It features a Cream dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-500bf1688c93]

Also known as: Sportsmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1977

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