Here are some examples:

People's Republic of China
Macao
Hong Kong
Japan
US Virgin Islands
Netherlands
Italy

Some are unused, some were mailed to the US from their original countries.  Some are clearly from 50+ years ago.  If you're interested, make me an offer.

Update:  And here are some pictures. http://www.flickr.com/photos/46235124@N00/6002348122/in/set-72157627340264284/