Seiko Cal. 6637 - 563

Released in 1987, the Cal. 6637 with design code 563 was part of Seiko's domestic market collection. Powered by the 6637 caliber with 32j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-be63ba7c4e31]

Also known as: Turtle, UFO

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1987

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