Xavier
rsirian1
I looked at three countries in SCWC (Numismaster) and Numista with KM numbers.
France 3588 Numismaster 3016 Numista 84%
Sweden 954 Numismaster 834 Numista 87%
Spain 1709 Numismaster 1302 Numista 76%
It just shows we are not exhaustive in adding the KM numbers.
Here are the numbers by replacing the condition of having a KM# number by a condition on coins dated 1500 to present.
France 3588 Numismaster 5660 Numista 158%
Sweden 954 Numismaster 1312 Numista 138%
Spain 1709 Numismaster 1725 Numista 101%
The data posted by @rsirian1 , at least as far as Spain is concerned, is very misleading and leads to errors, which is why one might think, as @Xavier said, that “It just shows we are not exhaustive in adding the KM numbers.”.
As we all know, KM codes separate each type by mint, so in Spain and many other countries like France, there are sometimes many subtypes (entries) that Numista lists on a single page, meaning the equivalence will never be exactly the same. Likewise, there are many non-existent KM numbers and many Numista entries without a KM number because Krause does not include that specific type.
Analyzing only Spain (from the first KM code to the last one of the Peseta system), Numismaster contains 1108 of the 1709 pages mentioned by rsirian, while Numista contains 1096 (meaning only 12 pages with KM codes are missing from Numista; we will analyze this further as they may be nonexistent types).
In other words, Numista contains 1108 Krause "types" within 734 "types or pages" in Numista.
In summary, Numista contains 98.92% of the existing KM codes for Spain from the beginning (1600) until the introduction of the Euro (and I don't believe any KM codes are missing in Numista from the Euro's introduction, so the final percentage will be even higher).
Coin referee for: Andorra, Equatorial Guinea, Marshall Islands, Moldova, Liberia and Spain
Banknote referee for: Andorra, Equatorial Guinea and Spain