Seiko Cal. 6635 - 521

The Seiko 6635-521 represents an important milestone in Seiko's 1995 lineup. Powered by the 6635 caliber with 23j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-f244be4468df]

Also known as: UFO, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1995

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