Seiko Cal. 6634 - 637

The Seiko 6634-637 represents an important milestone in Seiko's 1990 lineup. Powered by the 6634 caliber with 29j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-b905f7bf9699]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1990

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