Seiko Cal. 6643 - 550

The Seiko 6643-550 represents an important milestone in Seiko's 1986 lineup. Powered by the 6643 caliber with 36j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-6f52f7bbd055]

Also known as: UFO, Silverwave

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1986

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