Seiko Cal. 6640 - 105

The Seiko 6640-105 represents an important milestone in Seiko's 1997 lineup. It features a Burgundy dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-1120df235e28]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

90m

Dial Color

Burgundy

Jewels

17j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1997

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