Seiko Cal. 6658 - 740

This Spring Drive model from 1989 features a 40mm Hardlex-Coated Steel case. With its 22mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-58f02ff33c93]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1989

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