Seiko Cal. 6645 - 890

The Seiko 6645-890 represents an important milestone in Seiko's 1977 lineup. Powered by the 6645 caliber with 28j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-e04b6d085b57]

Also known as: UFO, Crown

Specifications

Movement

Solar

Case Material

Titanium

Case Width

36mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

28j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1977

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