Seiko Cal. 6640 - 201

The Seiko 6640-201 represents an important milestone in Seiko's 1988 lineup. With its 22mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-a21111f5aa48]

Also known as: Monster, Rally

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1988

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