Seiko Cal. 6640 - 101

The Seiko 6640-101 represents an important milestone in Seiko's 1979 lineup. It features a Green dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-b857ab062a87]

Also known as: Monster, Sportsmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

45mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1979

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