Year of the Pig
The gold foil in the stamp is meant to reflect the ancient art form of cloisonné that originated in Beijing in the Yuan Dynasty (1271-1368). The stamps were issued on Jaunary 5, 2007 but within a month around 250 of the stamps were found to be missing the gold and silver foil so that the enhancements of the floral design is not seen. Those .52¢ stamps are much more valuable to collectors as a result, some selling for as much as $1,000 each! My sheet are all nicely foiled.