Seiko Cal. 6631 - 593

Released in 1991, the Cal. 6631 with design code 593 was part of Seiko's domestic market collection. With its 20mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-6052bcad69be]

Also known as: Helmet, Crown

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1991

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