Seiko Cal. 6384 - 640

The Seiko 6384-640 represents an important milestone in Seiko's 1977 lineup. With its 21mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-579f3156131d]

Also known as: Helmet, UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

37mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1977

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