Seiko Cal. 6640 - 923

This Solar model from 1996 features a 37mm Hardlex-Coated Steel case. With its 22mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-615bae9090aa]

Also known as: Sumo, Goldfeather

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

36j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1996

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