Seiko Cal. 6640 - 762

The Seiko 6640-762 represents an important milestone in Seiko's 1988 lineup. With its 20mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-4e317654f7f4]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Cream

Jewels

35j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1988

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