Chinchilla was REALLY popular. However, even more popular and less expensive was Muskrat! That could be muskrat! ( Many times it was touted as seal fur because people didn't like that it could have come from the muskrat!)
Your best bet is to take it to a furrier and ask.
They made so many kinds of coats that it is too hard to tell from a picture. The up close pic sure looks alot different than the overall coat picture. Looks like small pieces, pieced together which would mean it could have been many/any animal/s.