what does the reference KM+nr mean ?
You can hover with your cursor over the KM or click on it.
Hello,
KM is the numbering system used in the Standard Catalog of World Coins. KM numbers are intended to identify the type of a coin.
It should be noted that KM numbers are unique only per country. For example, the number KM#1 is shared by hundreds of different coins: https://en.numista.com/catalogue/index.php?r=&ct=coin&ca=3&no=1
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