Seiko Cal. 6397 - 261

The Seiko 6397-261 represents an important milestone in Seiko's 1968 lineup. Powered by the 6397 caliber with 33j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-4b348836b2ca]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

43mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Burgundy

Jewels

33j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1968

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