@tawann, welcome to CCF and your English is fine. Certainly better than my French!
Interestingly, I can't find a specific legal tolerance for the Eagles, but rather just the comment that all gold coins must not be underweight (that is, *below* 33.931 g). I note that the stated allowable tolerance for our cents is 0.1 g and nickels is about 0.2 g. Based on those numbers, your coins seem to be pretty reasonable as to their weights.
I honestly don't know enough about the Eagles so can't comment one way or another as to their being fake or real. My only point is that at least in a first pass, the weights seem ok to me. Here are the relevant US legal codes if you'd like to do the research yourself.
31 U.S. Code § 5113 - Tolerances and testing of coins
31 U.S. Code § 5112 - Denominations, specifications, and design of coins
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
with Spence. On bullion, the mint is going to err on the side of caution to avoid producing underweight coins, so some may be slightly over the official weight. One other thing- I'm not sure if you've already noticed this, but the first coin is 1986, while the second is 1987.
Thanks for the replies, unfortunately, they are not reassuring :)
A friend of mine advise me to scratch one of them to be definitly sure they don't have a tungsten core. This is an option I will consider today.
@badogs, can you tell me which problems do you see from the pictures please ?
@999fine I took pictures in HD mode with artificial light, and not exactly on the top to get more light on the coin (to see details). It gaves a small "shadow" effect. (i might try to persuade myself :D )
@spence : Thanks, for the information. You're the second person to say that this 1% difference of weight could be normal.
We were using two scales
Mine : it shows a weight of 34,18gr (but it's cheap Chinese scale) The scale from the shop show a weight of 34,12gr witch is more acceptable
i think I will pick the scratch coin option to be sure.
I was also told by a gold seller that gold eagle can have different weight.
I copy / paste his answer for those who are interested.
The US Mint is known for not-so-exact measures and then your scale might be slightly off-balance.
When you weigh the coin you need to make sure that you don't breath around the scale and there is no window open, air vent etc. Even breathing in and out next to the scale will result in different measures.
You also need to do 5-8 weigh attempts, balancing the scale from time to time and then average out the result.
US Eagles are much harder to counterfeit than other coins, but they are out there. you can also do a ping test:
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Any counterfeit alloy will not result the pure „ping" than the US Eagle.
Am sure it will be fine.
If you are happy to pay the shipping back and forth, we can test the coin free of charge.
There are ways of testing silver and gold purity without doing a scratch test. One of my LCS has such a device. I think that it can tell if there is a tungsten core. However, it only works for flat items.
Since I wanted to be sure about my gold dealer and the coins he sells, I decided to split one of the coin in half and see if it was not filled with tungsten or anything else. It hurts me to damage a nice looking coin...
But all is good !
It's a bit extreme solution but I feel more confortable now and I still can enjoy my other coins without fear them to be fake.
Also this coin still can be sold for its weight value...
@badogs and @spence were right.
What do I learn from my experience ?
1- to pay extra extra carefull if I buy again with new gold dealer 2- American gold Eagles could have significant difference with the displayed weight and I m very newbie about US coins...