Seiko Cal. 6641 - 730

This Spring Drive model from 1979 features a 40mm Two-Tone case. Powered by the 6641 caliber with 33j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-796eddd9d174]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

33j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1979

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