The listing, USA #U556 1971 Liberty Bell 1.7¢ FDC postal envelope has ended.
USA postal envelope with First Day of Issue postmark
Year: 1971
Catalog # U556
Condition: First Day of Issue Cancel, not addressed / not mailed. Has minor pencil notation with catalog number and selling price at top from a previous owner. This can easily be erased with any standard pencil eraser
I have several of these, all identical, the scan is representative of what you will receive.
My general terms for stamp-related Listia lots can be found here (please read, it answers a lot of basic questions):
http://listiarules.webs.com/