If the plastic they are stored in is flimsy, thin, and clear with US Mint clearly shown on the plastic; or they are in a hard plastic “slab” with a certificate from NGC, PCGS, or ANACS, this would verify that they are genuine. US gold coins from 20 years ago would be made of 90% gold and 10% copper, but a one ounce coin would have one ounce of gold. Gold has gone up in value considerably since the mid 80s. The American Eagle annual bullion program was started in 1986, and it is likely these are the coins you have. They make 1oz, 1/2 oz, 1/5 oz, and 1/10 oz sizes in silver, gold, and platinum. When you see open, high, low prices, it is always for one ounce, and gold is currently at around $900 per ounce. I hope this helps.
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If the plastic they are stored in is flimsy, thin, and clear with US Mint clearly shown on the plastic; or they are in a hard plastic “slab” with a certificate from NGC, PCGS, or ANACS, this would verify that they are genuine. US gold coins from 20 years ago would be made of 90% gold and 10% copper, but a one ounce coin would have one ounce of gold. Gold has gone up in value considerably since the mid 80s. The American Eagle annual bullion program was started in 1986, and it is likely these are the coins you have. They make 1oz, 1/2 oz, 1/5 oz, and 1/10 oz sizes in silver, gold, and platinum. When you see open, high, low prices, it is always for one ounce, and gold is currently at around $900 per ounce. I hope this helps.