Hi. I have been offered a 1993 2oz $100 Platinum Koala at a very good price. I have not seen this coin yet. My research cannot find a $100 2 oz platinum Koala as all 2 oz platinum Koala coins are $200. Was a 1993 2 oz Koala minted with a $100 face value? Just trying to protect myself beforee I hand over the cash.