Originally Posted by
xanthuos
The currency restrictions are, to the best of my knowledge, on the FACE value of the currency or monetary instrument. If I'm bringing a 1969-S Lincoln Cent With a Doubled Die Obverse (value, about $35,000) in or out of the country, I believe it's only considered 1 cent.
From CPB.gov
“Money” means monetary instruments and includes U.S. or foreign coins currently in circulation, currency, travelers’ checks in any form, money orders, and negotiable instruments or investment securities in bearer form.
These bullion discs are referred to by numismatists as 'non-circulating legal tender', and are not necessarily perceived even as coins, given that their function is purely as bullion, there is no difference between importing 10 of these and importing 10 ounces of gold jewellery.