Seiko Cal. 6391 - 407

The 6391-407 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6391 caliber with 34j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-eefcc0b81fa9]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1975

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