Antique Art Nouveau

Where can I find information about a, possibly, antique Hand Mirror?
I have a hand mirror which I believe is silver-plated but I’m not sure. It’s in an Art Nouveau Style with a raised Floral Design. Markings include:
WM. A. ROGERS
3.000
PAT APL’D FOR
Does anyone know where I might find more information on this item? I’m not having much luck searching the internet.
I did a search for WM A Rogers, and found a lot of sites from different antique dealers. They want you to pay a fee for them to do a search for you. I’m afraid you will have to find a dealer, and pay for the search.
If you have the time, you can search through page after page of listings on ebay:
http://antiques.search.ebay.com/mirror_Silver_W0QQfsooZ1QQfsopZ1QQsacatZ20096