What is the value of a Antonious Stradauarous "Cremona" violin 1920?

Answer 1

He wasn't making violins in that century, so the value is small.
http://antiquesandthearts.com/forumresponse.asp?var=1296
"Any violin maker at this time period copied, to the best of his ability, the way in which Stradavari violins were made. So, what the likely meaning of the Stradivarious inscription on labels is that the violin is a copy made by another individual, the model of the violin would have been Antionious' Stradavarious."

Answer 2

This is not a true "Strad" since the Strads were created in the 17th century. If you have an instrument with a label like that, it is likely that there is a tiny "copie de" above the Stradivarius name, meaning "a copy of."

See:Requests to appraise an instrument.
http://beststudentviolins.com/StringCareSpecs.html#2