Seiko Cal. 6631 - 605

Released in 1975, the Cal. 6631 with design code 605 was part of Seiko's domestic market collection. With its 20mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-be718bdd46d4]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

36mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Champagne

Jewels

23j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1975

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