Try this site:

http://www.emotionscards.com/museum/vals.html

That is the history of valentine's cards, which may be the first greeting cards made.

I don't know if there are any samples from as far back as you are asking about, though.

Try here as well:

http://www.annieshomepage.com/valhistory.html

Check out #7 in this list -- it says it was cut by nuns in the 1700s

http://forums.ebay.com/db2/topic/Workshops/Secrets...