Seiko Cal. 6391 - 771

The Seiko 6391-771 represents an important milestone in Seiko's 1975 lineup. The Fixed bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-57b67c61e752]

Also known as: Sumo, Emperor

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

130m

Dial Color

Green

Jewels

26j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1975

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