Seiko Cal. 6640 - 961

The 6640-961 is a sought-after Quartz piece from Seiko's golden era. It features a Burgundy dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-1b37b1b5c098]

Also known as: World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

42mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Burgundy

Jewels

27j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1988

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