Magnet test of thin silver coins [Resolvido]

Hi. I've got various silver coins and a neodymium magnet slowly glides down them if I do a magnet test of them. If a silver coin is very thin (for example a thin low denomination .500 purity coin) will the magnet glide slowly or slide almost as if the coin was a standard non ferrous material? I've bought a coin that's 1.7mm thick and 22mm diameter .6 purity and the magnet slides almost normal (non ferrous) speed rather than glides but maybe that's just because there isn't enough silver material to create a magnetic attraction that would be the case with a very large .99/.925 silver coin.

post a photo of the coin please, but is this a coin worth faking? The best advice I can give is to practice on similar coins until you are confident and familiar with the reactions.

A .500 purity contains mostly copper. Copper reacts almost the same as silver on a neodimium magnet.
Please read how the system with magnets works:
https://en.wikipedia.org/wiki/Eddy_current

The coin is: https://en.numista.com/catalogue/pieces9584.html

All of the other silver coins that I've got are large thick coins. If I do a magnet test of them the magnet speed varies with the purity of the silver but they have a lot of mass so the magnet has more material to magnetise. With the Japanese coin its thin (1.7mm). This is a photo of the actual coin. Thanks for your help

Your coin is genuine. I have never seen a fake of them and I can pick them up often for under melt even in unc so there is no shortage of them.

And to your test if you use the same magnet on big chunky coins and small slim ones you will get different results the weight of the magnet plays a roll in it. You should try using a lighter/ smaller magnets on little coins.
But also on low value coins a caliper and scales should be sufficient.

Idolenz. Thanks for the answer. I felt the coin was genuine but for my own reference I wanted to views about magnet tests for the future. Then if I get thin silver coins in the future I know what to expect.... Thanks for your help (by the way I didn't pay much for the coin so didn't think it was potentially a valuable find the question was more for future reference).