Seiko Cal. 6640 - 512

Released in 1985, the Cal. 6640 with design code 512 was part of Seiko's domestic market collection. It features a Burgundy dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-39857c720a8e]

Also known as: Rally, Crown

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Burgundy

Jewels

27j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1985

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