Seiko Cal. 6661 - 640

The Seiko 6661-640 represents an important milestone in Seiko's 1977 lineup. Powered by the 6661 caliber with 21j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-9c84488a61b8]

Also known as: Goldfeather, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

34mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1977

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