Seiko Cal. 6640 - 632

The Seiko 6640-632 represents an important milestone in Seiko's 1973 lineup. It features a Champagne dial protected by a Acrylic crystal and offers 170m of water resistance. [seikata-wm-9000b3c6a856]

Also known as: Golden Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1973

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