Seiko Cal. 6658 - 987

The Seiko 6658-987 represents an important milestone in Seiko's 1990 lineup. Powered by the 6658 caliber with 23j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-636be0f3e798]

Also known as: Helmet, Sea Horse

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

40mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

23j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1990

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