COIN AND METHOD FOR TESTING THE COIN

Canada Patent

PATENT NO 2879488
APP PUB NO CA-2879488-A1
SERIAL NO

2879488

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Coin (10) comprising a core (1) of a first metal, an outer ring (2) of a further metal, concentrically surrounding the core, and, between the core and the outer ring, a central ring (3), consisting of an electrically insulating material and solidly bonded to said core and outer ring, characterized in that the central ring is transmissive with respect to electromagnetic waves of a first wavelength range and less transmissive or untransmissive with respect to a second wavelength range.

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