Hello, Figleaf.
All I can say is that in all the years I have "known you", your information is always valuable; your knowledge seems endless and your generosity in sharing is very much appreciated...always. Thank you.
With my Composer Coin collecting, I do rely heavily on KM numbers and Y numbers. There are so many new composer coins coming on the market these days and my last copy of the Standard Catalog of World Coins 2001 to Present is from 2017, I need to become more current. Also, I am still participating in some research on the topic of Composer Coins with an author here in the U.S. and I have assigned myself the mission of getting the new KM or Y numbers for all new or recent issues that I have in my collection and those that I find on E-Bay or elsewhere. Numista is a wonderful source of information but they too and not current with new catalog numbers. I don't know how popular collecting Composer Coins is but I am assuming the interest in them is growing or there would not be so many new issues. I want those catalog numbers. I have seen a photo of the new guide on Amazon. It had a blue cover, but have called and searched online to no avail.
Now, I could discuss the "merit" of some of these new composer coin issues but that's if for another time and place.
As always, Figleaf, thanks!! Alan