Seiko Cal. 6646 - 828

The Seiko 6646-828 represents an important milestone in Seiko's 1971 lineup. Powered by the 6646 caliber with 25j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-5ee5b2351abb]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

39mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1971

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