Seiko Cal. 6658 - 727

The Seiko 6658-727 represents an important milestone in Seiko's 1976 lineup. Powered by the 6658 caliber with 28j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-2fc3a509e3ca]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

35mm

Case Thickness

13.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1976

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