Seiko Cal. 6371 - 640

The 6371-640 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6371 caliber with 26j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-d28b31cd6e22]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1972

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