Seiko Cal. 6391 - 409

The Seiko 6391-409 represents an important milestone in Seiko's 1974 lineup. Powered by the 6391 caliber with 24j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-1605faa4cc77]

Also known as: Sumo, Flighty

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Burgundy

Jewels

24j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1974

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