Thanks to your help I found out what this thing is. Now that I know, I'm finding a number of them on the internet that are very similar. The one problem with the one I found is that it's missing a decorative oval that would have made a complete buckel.
It is an 18th Century Mens Neckwear Silver Stock Cravat Buckle. In the Georgian Era of the 1700's, men wore them as a fastener on the stocks around their necks.
Thank you guys, you got me going in the right direction.![]()