Seiko Cal. 6640 - 954

The Seiko 6640-954 represents an important milestone in Seiko's 1982 lineup. It features a Black dial protected by a Sapphire crystal and offers 160m of water resistance. [seikata-wm-33bd6c213647]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1982

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