Belgium 1 Centime wrong planchet ?

I just bought a huge undocumented hoard of world silver coins, among them was this one sided silver 1 Centime
This type was only struck in copper between 1832 -1899
This one is blank on the reverse but with beading showing and it is a reeded edge
It is the same size and weight (1gram) as the 20 Centimes which was struck in silver between 1852 - 1858.
It tests positive for silver.
Has it been struck one side on a silver planchet ?

 

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Could it be a test pattern?

 

very interesting.

 

I thought it would catch your attention, even without tagging you