Seiko Cal. 5661 - 890

The Seiko 5661-890 represents an important milestone in Seiko's 1970 lineup. Powered by the 5661 caliber with 31j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-b286879d049e]

Also known as: Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

White

Jewels

31j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1970

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