Seiko Cal. 6391 - 271

The Seiko 6391-271 represents an important milestone in Seiko's 1990 lineup. Powered by the 6391 caliber with 23j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-dd8364711e12]

Also known as: Tuna, Navigator

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

23j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1990

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