Seiko Cal. 6640 - 749

This Spring Drive model from 1985 features a 39mm Hardlex-Coated Steel case. With its 21mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-7e6eafe639db]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Silver

Jewels

21j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1985

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