Why did coin premium spike on Dec 26th?

[Bongleur]

The minimum premium is fairly stable at about 3% but suddenly spiked to 7%.  The maximum stayed the same at about 7%, which seems to be its average value.

Is this a regular end of year seasonal phenomena?

Is there a time of year when the premium is probably lowest?

http://goldprice.org/gold-prices/1003-G ... -Eagle.htm

[Tortoise]

The minimum premium is fairly stable at about 3% but suddenly spiked to 7%.  The maximum stayed the same at about 7%, which seems to be its average value.

Is this a regular end of year seasonal phenomena?

Is there a time of year when the premium is probably lowest?

http://goldprice.org/gold-prices/1003-G ... -Eagle.htm

Looks like a glitch in the plot to me. Note that on December 27, 28, and 29 on that plot, the min, max, and average curves converged into a single curve. There's no way that's real.

[AdamA]

When did they issue the 2012 Eagles?