Seiko Cal. 6640 - 544

The Seiko 6640-544 represents an important milestone in Seiko's 1995 lineup. It features a Cream dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-9ac37de4d21c]

Also known as: Monster

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

44mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Cream

Jewels

33j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1995

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