Seiko Cal. 6642 - 647

The Seiko 6642-647 represents an important milestone in Seiko's 1982 lineup. With its 21mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-1110d4028747]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Burgundy

Jewels

35j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1982

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