Seiko Cal. 6644 - 847

The Seiko 6644-847 represents an important milestone in Seiko's 1977 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-52063a96e060]

Also known as: Monster, Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1977

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