I am an intermediate/amateur connoisseur of sorts for vintage and antique military items. There are specific trading and verified auction sites online but thanks to dumb asses that don't do their research, on eBay and Amazon, you can find great bargains such as a 1902 ceremonial U.S. Navy Infantry cord? or a Marine Corps officers ring w/ sky blue crossed rifles and the USAR eagle insiginia and the WWII Field Artillery braclet (CIB). If only their was some sort of worldwide database you could search for pictures and knowledge.