We don't know what this is, but it is old and interesting. It appears to be a sepia-colored horse print or etching underneath a bulbous piece of glass with a pewter-appearing backing and copper-appearing bracket fixed to the back. Perhaps it is a button? Perhaps it is a saddle decoration of some kind? Feel free to email me with questions, but I don't know that I'll be able to answer them.
On Jul-25-08 at 13:41:29 PDT, seller added the following information:It is a bridle rosette!! Thank you for the feedback.