The eBay decanter is here
cgi.ebay.co.uk/EMPOLI-Italian-Art-Glass-Decanter_W0QQitemZ7356470258QQcategoryZ994QQrdZ1QQcmdZViewItem
Looks different in shape but it has the nipple and the same decoration.
Anne, your decanter is an Empoli decanter or Empoli copied it from some other glass maker.