On Numista, What Do The Reference Numbers KM# And Schon# Mean?

Google can be your friend KM https://www.greatcollections.com/kb...-t143-4.html
John1

I put the KM# on the 2x2 for easy reference. It just makes it easier to just do a quick find in the PDF if you are using a digital version. Click on the country and then do a search for "KM# xx" and it comes up right away without any scrolling to the denomination and then looking for the year. This is especially helpful if you are using the digital file on a tablet as scrolling and zooming is time consuming.

As others have stated above, KM numbers are from the American-issued Krause standard catalog. Schon numbers are from the Schön Weltmünzkatalog (world coin catalogue), which is printed in Germany (and only in German). The English-language version of Schon stopped being printed in 1988, once Krause secured dominance in the English-speaking world, thoguh you might find a copy on the second-hand market.

English-speaking collectors tend to use Krause, even if they are not from America, mainly due to the lack of English-language alternatives (the Yeoman books are still around, but nowhere near as popular as they used to be). European non-English-speakers tend to use Schon, even if they are not from Germany, as the prices given are in euros so it saves having to do a currency conversion. The Numista site is French-based, so does not surprise me that Schon numbers are prominent. I have an old 1970s copy of Schon I bought second-hand, but my German isn't good enough for me to be comfortable using it.

From a neutral point of view, Schon is the more comprehensive catalogue, listing numerous varieties and subtypes not listed in Krause. I own at least one coin that's listed in Schon but not in Krause; I posted that thread over ten years ago, and that coin still isn't listed in Krause.