Seiko Cal. 6657 - 727

Released in 1983, the Cal. 6657 with design code 727 was part of Seiko's domestic market collection. It features a Black dial protected by a Acrylic crystal and offers 130m of water resistance. [seikata-wm-6b04b337dc1b]

Also known as: Bullhead, Emperor

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1983

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