Seiko Cal. 5661 - 285

The Seiko 5661-285 represents an important milestone in Seiko's 1973 lineup. Powered by the 5661 caliber with 18j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-df00b9b55a51]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1973

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