Seiko Cal. 6331 - 170

The 6331-170 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6331 caliber with 21j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-81b8acf7f2d3]

Also known as: Tuna, Arnie

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

43mm

Case Thickness

10.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1985

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