Value of Haviland China?

I recently came across a set of Haviland fine china, #1 Ranson. While cleaning them I noticed marks on the back of some of them stamped as Thomas-Bavaria Germany. They look pretty much exact with the Thomas being slightly smaller. I could not find this Thomas mark online and was wondering if this could be a replica. Also, I was planning on selling the Haviland and would like to know the value. Thanks.

By Mary F