I checked through my various trees and could not come up with a Magdalena Vercellino. My first question would be, do you know the name of Effizio's father? Do you have the name of a town? Effizio is not a common name in Salassa. I notice that his surname is the same as his mother's. Was she married when she had him or were his parents related and bore the same surname. Do you have Effizio's naturalization papers. Those may give you further information as to his hometown. That's how I discovered where my grandfather was born. Do you have his death certificate? That will sometimes give the parents names. Usually on the immigration documents they give the name of the nearest relative in Italy. No luck there? Then you could go on the familysearch.org site and look through the towns listed under church records for Italy. They're quite substantial. I wish I could be of more help to you but you really need the name of the town where he was born. Good luck on your research.