These Double Eagles might have demonstrated a significant price performance history in the past, but I wouldn't allocate more than about a 5% position in your portfolio for them. Who is going to pay you more than melt in a SHTF scenario? They're only good for investment purposes in a stable environment, which we most certainly do not have now. If you want to enjoy numismatics and still be able to get your money back if needed, stick with VF/XF/AU that you might be able to find very close to melt value.