these three coins from Ghana (5 Pesewas, 10 Pesewas, 20 Pesewas) are all listed as "Copper-nickel". But all three coins are magnetic. I suppose that they are made of stainless steel, but it could also be Nickel-plated steel or something else. Can anybody check and modify?
Well spotted, I've checked my Krause which has confirmed they are Nickel clad Steel. You will need to make a modification request on each of the Numista pages for the admin to be able to verify them.
Just because you can't see it ... doesn't mean it isn't there - Anon.
By the way - is there a simple way to identify if a coin is stainless steel or nickel-clad steel?
Stainless Steel should be non-magnetic
I do not think so. I know, "real" stainless steel should be non-magnetic, but there are also alloys called stainless steel which are magnetic. And I guess for coins usually these (cheaper) alloys are used.
I changed them now - thanks.