Seiko Cal. 6391 - 738

The Seiko 6391-738 represents an important milestone in Seiko's 1973 lineup. With its 22mm lug width and 8.3mm profile, it sits comfortably on most wrists. [seikata-wm-5384f2fafa75]

Also known as: Helmet, Navigator

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

180m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1973

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