Seiko Cal. 6640 - 360

Released in 1984, the Cal. 6640 with design code 360 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-ad424cd39f44]

Also known as: UFO, Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1984

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