We are located in the south shore of long island in Baldwin and do not have ontacts with conservators. The brown splotches appear to be from a painted design that has worn off I have not attempted to clean off the dust. Some of the lines you see in the photo are from where pieces fell off and may disappear with cleaning. I’m very concerned about the loose piece that needs to be glued back. Is there a certain type of glue to use? I was also thinking about asking somenoe to build a wooden frame for it to help protect it and make it easier to display.