Seiko Cal. 6646 - 557

This Spring Drive model from 1991 features a 45mm Hardlex-Coated Steel case. With its 20mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-d4cc3295ed7d]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1991

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