On June 3, 2010, the United States Mint ended sales for the Letitia Tyler and Julia Tyler First Spouse Gold Coins. This coincided with the release of the latest coin in the series honoring Jane Pierce. The Tyler coins were both available for a shorter time frame than typical for recent releases of the series, which resulted in lower sales.
The Letitia Tyler First Spouse Gold Coin was first available for sale on July 2, 2009. The coins were priced at $629 for the proof version and $614 for the uncirculated version. When last available the coins were priced at $779 and $766 due to the higher underlying price of gold. After a sales period of just under eleven months, the coins had last reported sales of 5,163 proof coins and 3,152 uncirculated coins.
The Julia Tyler First Spouse Gold Coin went on sale August 6, 2009. The coins also carried initial pricing of $629 for proofs and $614 for uncirculated coins and were last priced at $779 and $766. The most recent sales figures indicate 4,830 proof coins and 2,861 uncirculated coins sold by the United States Mint. The sales period was roughly ten months in duration.
The Letitia and Julia Tyler coins were both issued for the 10th Presidency, since President John Tyler had a first and second wife while in office. A similar situation will arise in 2013, when coins are issued to honor the first and second wives of President Woodrow Wilson.
Because five coins were offered in the prior year compared to the standard four, the United States Mint chose to end sales of two coins to coincide with the start of sales for the latest coin. In general, the US Mint has indicated that they will keep each release of the First Spouse Gold Coin series on sale for approximately one year or until the maximum authorized mintage has been sold. In practice, they have ended sales for the longest available coin when a new one was offered. This has sometimes resulted in an availability period of greater than one year.
The last reported sales of the Letitia Tyler and Julia Tyler coins suggest that mintages will rank as the lowest on record for coins of the series no longer available for sale. These mintages will also be extremely low on a historical basis for modern gold coins issued by the United States Mint.
The Julia Tyler coin in PR70 is out of stock everywhere and prices have gone crazy on auction sites on this one coin.
As this is the only pretty coin in the bunch my guess is its low mintage combined with a pretty coin have added to its collectability.