Many coins have been minted in both copper-nickel and silver versions. While some countries differentiate these by giving them different denominations or by including an identifying mark on the coins, some appear to be minted without any obvious way to distinguish one from the other. For example, I have Algeria KM-105/105a and Sough Georgia & South Sandwich KM-1/1a in front of me. In both cases, Krause states the exact same size and weight for the cupronickel and silver versions, and I'm not aware of any differences in details between each version. So, what's the best/easiest way to know for sure whether I'm holding the cupronickel or the silver version?
Topic moved to "Numismatic questions"(ZacUK, 27 Sep 2020, 06:31)
Cupronickel is lighter then silver. So if the weight and diameter are then same, then the silver coin has to be skinnier. You could also try the "ping" test, if you know what silver sounds like.
I read on here somewhere that placing tissue over it is another way -
if it is silver it is white, or copper-nickel it is dark.
Here is one topic of many ... https://en.numista.com/forum/topic5933.html#p829325
