Seiko Cal. 6640 - 882

Released in 1971, the Cal. 6640 with design code 882 was part of Seiko's domestic market collection. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-9cc8291dc5be]

Also known as: Sumo, Crown

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Cream

Jewels

24j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1971

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