Hi,
This: https://en.numista.com/catalogue/pieces453.html is missing the 1955 Arnprior 'die break' variety. Along with the normal 1955 and the arnprior 1955, this coin has a die break in between the T and I of "GRATIA" and is recognised (at least here in Canada) as a separate variety.
OK thanks, but in the Canadian catalogues they separate the Arnpriors into the die break and the one without because there is a significant price difference.
Anyways, if it is Numista policy to go by NGC that's fine, otherwise I could send you pictures of my catalogues to prove the differentiation.