Seiko Cal. 6391 - 771

The 6391-771 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 32j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-842ed579541e]

Also known as: Tuna, Rally

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

8.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1977

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