Seiko Cal. 6640 - 431

The Seiko 6640-431 represents an important milestone in Seiko's 1998 lineup. It features a Burgundy dial protected by a Mineral crystal and offers 60m of water resistance. [seikata-wm-d177873630ae]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1998

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