The listing, USA US Postal Service inauguration 1971 has ended.
The US Postal Service was inaugurated on July 1, 1971 (prior to that it was the US Post Office Dept.).
Condition: First day of issue of the stamp, unaddressed/not mailed, Detroit cancel
GIN is available...
I have only several of these, the scan is representative of what you will receive.
Shipping will be via standard first class mail (#10 business envelope) with a stiffener. Regular 1st class mail postage is free, but if you want tracking, you will have to pay extra for this ($2.54 for 1st class tracking within the USA, no tracking available outside the USA).
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/