What would you pay max for these coins?
I learned my lesson the hard way, bought many limited mintage gold, platinum, palladium coins and sometimes even when the metal goes up you might end up losing money on the coins because of the premium you paid over spot. Those coins are the bread and butter of brokers, they try to push them to the ignorant buyers, the best coins to buy are the ones that have no premiums, that is if you are buying a gold coin, and spot gold is $1200 you can buy an American Eagle, Buffalo, or Canadian Maple Leaf among others for $1215 or $1220. If gold goes up your coin moves up the same amount. Now if you go buy a numismatic coin let us say a Liberty for $3800 , some time even if gold goes up, since you paid $2600 over spot or melt, you might lose big.