It appears that the problem may lie with the automatic conversion between AH & AD dates. Note that the coin is specifically dated as 1965 and appears to be the coin listed as being dated 1966 on the list. In cases like this (dual dating), the AD dates should be used rather than the AH dates.
As you observed, it seems to be a mistake, unfortunately I don't have updating rights.
Administrateur du catalogue, référent de nombreuses nations antiques et de la Lorraine.
Catalogue administrator, numerous Antique nations and Lorraine referee.