Seiko Cal. 5631 - 618

Released in 1978, the Cal. 5631 with design code 618 was part of Seiko's domestic market collection. It features a Champagne dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-473e37be2af5]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

30j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1978

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