Seiko Cal. 5631 - 524

Released in 1969, the Cal. 5631 with design code 524 was part of Seiko's domestic market collection. With its 19mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-fa32062cf9c7]

Also known as: Monster, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Black

Jewels

17j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1969

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