Originally Posted by Idle

You can contact a art auction house and ask them to take a look. They see things like this on a daily basis and have some folks that know a little about everything when it comes to art.

They are, of course, looking for things to put in a auction and snag a 30% commission on so they don't mind giving a quick opinion on anything that is put in front of them. I have been told that some of their best finds come in like this.