Seiko Cal. 6640 - 403

Released in 1990, the Cal. 6640 with design code 403 was part of Seiko's domestic market collection. It features a Champagne dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-821ebb22ef54]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Champagne

Jewels

29j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1990

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