Seiko Cal. 6635 - 388

Released in 1974, the Cal. 6635 with design code 388 was part of Seiko's domestic market collection. Powered by the 6635 caliber with 20j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-ad8dc767d9d7]

Also known as: UFO, Bellmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

120m

Dial Color

White

Jewels

20j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1974

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