Seiko Cal. 6631 - 728

The Seiko 6631-728 represents an important milestone in Seiko's 1995 lineup. Powered by the 6631 caliber with 23j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-690fdeb000a6]

Also known as: Bellmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

110m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1995

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