Seiko Cal. 6644 - 527

This Spring Drive model from 1983 features a 42mm PVD Black case. Powered by the 6644 caliber with 35j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-a1e40ccc15be]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1983

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