I dont know whether it applies to this specific accordion but I believe that Bugari uses the Silver and Gold names for instruments that are built to a higher standard, including a mano (hand made) reeds. Whether it is Silver or Gold is just a matter of the color of metal parts like bellows corners. Key tops are also in pearl rather than plain white, but you of course do not hear the difference. The a mano reeds are what makes the difference you can hear.