Seiko Cal. 6640 - 633

The 6640-633 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Black dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-2dff328962b8]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1982

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