Planchet Error On My 1826 Centesimo?

I found this in a part of my grandfather's collection that seemed to include a lot of questionable planchets for one reason or another. A closer look at this one seemed to point to the wrong planchet for this 1826 one centesimo coin from the kingdom of Piedmont-Sardinia. It has a diameter of 15mm (not the called for 19mm per Numista) and a mass of 1.23 g (not 2g per Numista). The legends are cropped short and the image of the shield on the obverse seems to be slightly off center. Also, the rim has what I think is called a fin, which I tried to capture in the images above. Notice the beveled edge (?) in the vertical shot. I understand that these coins were sometimes cut for the extra copper. Or might have been counterfeited. Or perhaps a hundred years of wear... But to me those explanations don't seem likely. Of course the treasure hunter in me would think of it that way.

More importantly, what do you all think?