Seiko Cal. 6661 - 525

The Seiko 6661-525 represents an important milestone in Seiko's 1971 lineup. Powered by the 6661 caliber with 35j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-1b710fd134df]

Also known as: Tuna, Navigator

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

35j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1971

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