Seiko Cal. 5231 - 240

Released in 1978, the Cal. 5231 with design code 240 was part of Seiko's domestic market collection. With its 21mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-ab794cbd908d]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1978

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