Seiko Cal. 6391 - 731

The 6391-731 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 22j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-2c9b213b8b62]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

12.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

22j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1986

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