Hi Abit bored so I posted this inquiry http://www.ebay.com/itm/Rare-500-gr...pt=US_Bullion_Bars_Rounds&hash=item4188db66ba Such high premium and no history details of this vintage bar... not even listed in allengelhard.com website... Seeing other sold ones on $400-$550 mark Is this ultra scarce? or just buyer/supply demands?