Seiko Cal. 6658 - 187

The Seiko 6658-187 represents an important milestone in Seiko's 1971 lineup. With its 20mm lug width and 11.7mm profile, it sits comfortably on most wrists. [seikata-wm-16ae2790d5f9]

Also known as: Helmet, Bellmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1971

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