Seiko Cal. 6661 - 604

The Seiko 6661-604 represents an important milestone in Seiko's 1973 lineup. Powered by the 6661 caliber with 31j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-13844b43837f]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1973

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