Seiko Cal. 6640 - 813

Released in 1984, the Cal. 6640 with design code 813 was part of Seiko's domestic market collection. It features a Black dial protected by a Mineral crystal and offers 100m of water resistance. [seikata-wm-00adcf540de9]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1984

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