I previously 'invested' in those type of 'rare' gold medals. Would advise against buying such material …. I basically needed to offer 'at spot' ( and on a few occasions, even less than spot ) when I needed funds returned. I recall a set of South Australian commemoratives - Gold, silver & bronze - only 150 produced ( 10 presented to VIPs, so only 140 available to public ). I picked it up 'cheap' … but 'cheap' is all I could sell the set for. If you have actually purchased this ( or other similar ) set, you could try Gumtree ( no selling fee ), as Ebay will reduce your return to well below spot price.