I don't think it's a case of breaking, as the repeat of the same amount removed, but in different places around the coins, would seem to show deliberate intention. Different areas show different shapes to the cut, semi-circles, 'V' cuts, square cuts, etc. There are notes of testing coins in a number of publications and I have no problem with the need to prove a coin is not a base metal 'silvered' forgery, but it's the acceptance of the coin in later transactions that bothers me!