Seiko Cal. 6391 - 538

The Seiko 6391-538 represents an important milestone in Seiko's 1968 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-5da923b3bb79]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Silver

Jewels

24j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1968

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