Seiko Cal. 6631 - 948

The Seiko 6631-948 represents an important milestone in Seiko's 1975 lineup. With its 18mm lug width and 13.8mm profile, it sits comfortably on most wrists. [seikata-wm-60ee5bd9cf0c]

Also known as: Helmet, UFO

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Burgundy

Jewels

32j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1975

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