Seiko Cal. 6391 - 791

The Seiko 6391-791 represents an important milestone in Seiko's 1968 lineup. Powered by the 6391 caliber with 29j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-a6fd8923f7b1]

Also known as: Bullhead, Arnie

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1968

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