Seiko Cal. 6640 - 172

The Seiko 6640-172 represents an important milestone in Seiko's 1987 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ab60be1913a8]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1987

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