When you enter or validate coins with Krause numbers type C#..., frequent in the 18th century, you should not use the C that shows in the menu for reference catalogues, but put KM#Cxxx.
C refers to William Craig Coins of the World.
The problem is that often, C# numbers in Krause are old numbers that are being changed with newer editions.
I ask Xavier in Forum "Site Numista bug" to change C by Craig to avoid errors.
As an example. search for the reference C#1, you will find plenty case that should be corrected.
Quand l'Histoire et la Géographie se croisent sur nos pièces de monnaie ...
Administrateur du catalogue, référent de nombreuses nations antiques et de la Lorraine.
Catalogue administrator, numerous Antique nations and Lorraine referee.