Seiko Cal. 6640 - 130

Released in 1976, the Cal. 6640 with design code 130 was part of Seiko's domestic market collection. It features a Green dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-b5b78e6085c4]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

43mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1976

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