Seiko Cal. 6661 - 637

The Seiko 6661-637 represents an important milestone in Seiko's 1980 lineup. Powered by the 6661 caliber with 28j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-1f55c5f4b041]

Also known as: Panda, Rally

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1980

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