Seiko Cal. 6644 - 520

The Seiko 6644-520 represents an important milestone in Seiko's 1980 lineup. Powered by the 6644 caliber with 26j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-09afa26cfc62]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

38mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1980

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