Cres[c] Concordia Fake?

The piece is supposed to be a silver Rider (ducaton) from the Netherlands state of Zeeland. KM57 . It should weigh 32.78 grams. I suspect a Chinese Counterfeit, not silver- there are details that do not match the care taken with striking these pieces- the nose of the rider, the legs of the horse, the weakness of the middle of the shield design, the beading around the rims, for example.
Also, is the Australia crown the same type of counterfeit? It is weak in many places, and there appears to be casting signs among the lettering, with some weak and strange details. The weight should be 28.28 grams.

The fake LOOKS convincing enough. At the obviously low weight, the suggestion is that it is possible that it was made for trade, to defraud. In the contemporary market place, it would not have been weighed every time it was used in a transaction. My guess is that it would be probably made of iron, first copper plated then silver plated. The double plating allows the silver to stick better. Is the fake magnetic?

The fact that it is so underweight makes it an easy coin to detect by a numismatist, such as us in the CCF.

Silver has a density of 10.5 g/cc, copper 8.93g/cc, iron 7.87 c/cc. Proportionally, to the Aussie crown next to it, the diameter of the fake is OK at 41mm. I measured the coins in the picture off the screen with a scale, and calculated the diameters proportionately. For information, the crown is actually 38.5 mm diameter.

Relative to the densities I have indicated, the fake must also be a tiny bit thinner than a genuine Dutch silver Rider.

I would therefore suggest a copper alloy core.