Seiko Cal. 6640 - 616

Released in 1980, the Cal. 6640 with design code 616 was part of Seiko's domestic market collection. It features a Cream dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-30ab8638aa31]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1980

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