Possible to have a 1975s proof set with Ike Dollar unfrosted portrait?

It is more than likely due to a number of different situations.

 

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The frosting on the coins is called cameo. It's possible this is just a normal coin . after lots of use the cameo appearance will wear off the coin dies and then they are smooth. maybe this is the problem with your coin.

and for the weight issue it would be about impossible to know the correct weight of one coin while still in the mint pack with other coins. the problem here would be which coin doesn't have the correct weight.

 

Let alone the unknown variation in the packs.

 

thanks for adding in what I left out .

 

That is what I exist for

 

I was looking for a way to determine weight and I don't think the 1976s proof set could be within tolerances for a set with a silver '75 Ike. The '76 proof set has a case and coin weight of 126.8g while the '75 set has a case and coin weight of 129.6g. I subtracted coin weights from each total(set and coin) and came out with: 76.73g case for the '76 set, 77.62g for the '75 set. I used the coin weights from a coin book to determine weight of coins. I then did tolerances, 4% +/- each coin. For the totals of the '76 case I came out with a low end of 124.795g and a high end of 128.804g. For the '75, low was 127.516g and high was 131.684g. I then did an average of case weight by subtracting coin weights from the case and coin weight: 76.73g for '76, and 77.62g for '75, which came out to an average case weight of 77.18g. I then did the math for tolerances using this number(77.18g) and came out with a low of 125.25g and high of 129.25g for the '76 set. The numbers I got for the '75 set were 127.08g low and 131.24g high. My case and coin weigh 129.6g so it would just be out of the range of the high for '76. I understand there could be other factors in play, but this is just my reasoning.

 

I did some research and found out that you cannot tell whether the coin is silver by looking at the copper on the edge because it is only 40% silver and not 90%. 90% would show gray.