Seiko Cal. 6640 - 366

The Seiko 6640-366 represents an important milestone in Seiko's 1997 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 80m of water resistance. [seikata-wm-f2bdb4645ce6]

Also known as: Panda, Navigator

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Champagne

Jewels

22j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1997

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