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It will also be interesting to see if the Au content stays at .24187 ozt, as PL 114-148 doesn't specify a weight for the coin. It does say that the diameter has to remain at .850 inches. I haven't seen anything from the Mint on how they will accommodate these specifications in the coin, but it looks to me like either the overall weight, Au weight or thickness will have to change.
I posed this question some time ago, and now that the designs have been released it can be answered.
The coin specifications from the Mint's website are that it will weigh 7.931 gm which is 5.12% less than the "normal" 8.359 gm for commemorative half eagles. By law, the diameter remains the same at .850 inches. I was hoping that the Mint would increase the coin thickness to maintain the "normal" amount of gold in a half eagle, .24187 ozt of gold, but they obviously didn't. My guess is that the thickness didn't change and the overall weight reduction is consistent with the composition change.
This "new" $5 coin (can't call it a half eagle, guess we'll have to come up with a new name) with a lower overall weight and lower percentage of gold content will only have .21674 ozt of gold, 10.4% less than a traditional half eagle gold coin.
With gold currently between $1300-$1350, if the $5 proof coin were available today its price would be $436. Last year, the price for the Boy's Town $5 commemorative with gold at this price would have been $429.75. So, that's a $6.25 (1.45%) increase for 10.4% less gold, no silver at all and 247% more in copper. Given the lower gold content, this amounts to around a 13.4% price increase for the gold proof coin. The Unc would be similar (+11.9%). Not as steep as the half dollar increases (+19.3% Unc, +17.9% Prf) and worse than the dollar increases (+10.2% Unc, +9.6% Prf).
BTW, another subtle pricing change is that the $5 proof coin is now $10 more at each pricing level than the $5 uncirculated coin. It used to be a $5 pricing difference.