Now this is a fascinating piece sent from the 1997 International Stamp Expo in San Francisco. The convention center which hosted the event had many tourist guiides on hand that included this map inside. So, Dennis and Chad picked a friend in the city and drew an arrow to his house on the map. But you also must understand that the USPS created a special "cancellation stamp" for each day of the expo... this may be the only piece of mail in existance that was cancelled with ALL of them... as though it had been sent on five different days. Click here to see an enlarged detail of this piece.