Seiko Cal. 6640 - 605

The 6640-605 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Acrylic crystal and offers 130m of water resistance. [seikata-wm-e9f993ccc9dc]

Also known as: Monster, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

25j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1974

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