“At the sight, it is only distinguished by the screen printing of the case, where the «64» is replaced by a «72»”

I recall reading somewhere that, to give an artificial boost to the home grown market. The French introduce a law to ban the import of personal computers with less then 72kb of ram. The British got round this law by adding a small pcb to the main board, that did nothing at all. Unless it was the Spanish, funny what you mis-remember.