Take a photo of it and post it for free with http://photobucket.com/
Have it appraised by a reputable Company.
If you need a list of the best Auction houses who deal in these sort of pieces ie.identification,evaluation,appraisals and ability to get the best offers,here you go;
http://www.christies.com/home_page/home_…
http://www.sothebys.com/
http://en.wikipedia.org/wiki/igavel……..
Other great referencing sites with Fine Art on line galleries are;
www.askart.com, the link is below;
http://ca.search.yahoo.com/bin/search?fr…
www.artprice.com here is the link;
http://ca.search.yahoo.com/bin/search?fr…
www.absolutearts.com the link is;
http://ca.search.yahoo.com/bin/search?fr…
Whatever you do, do not post it with E Bay, you will not get the best pricing for your piece, speaking from my experience.
Some of these mantel clocks are fetching high prices especially when they are German or European made.
Hope this helps, Good Luck.
Cheers!