Seiko Cal. 6391 - 412

The Seiko 6391-412 represents an important milestone in Seiko's 1969 lineup. Powered by the 6391 caliber with 31j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-8e876bb47aff]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

38mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Silver

Jewels

31j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1969

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