Vic:

The emblem you are referring to is the American Embassy Seal (Depart of State). Here are a couple of links that show the seal;

Link 1
Link 2
Link 3

Perform an advanced search on Google for "American Embassy" and then click on the images tab. I am sure you will find many more pictures of the emblem. Also, if you do the same type of search using "Department of State" you will see many images of the seal.

Here is one of the better ones that I found