I am scratching my head at the eBay auction. Who is Luciano Gambaro? I know of Mario Gambaro. I'll have to check on Luciano. Can anyone make out the signature on the duck? To me it looks like scribble.
wolkenreb, your duck does look a lot like Gambaro & Poggi's duck except that yours is hollow and ribbed. Rosie knows a lot more about this style duck than I do, so she may be more help. Another company, Campanella, makes a similar style duck.