There have been many pictures on the $1 postage stamp. The most recent stamp pictures Scott Number 3766 shows 'Wisdom.'
No such thing as a 'mint stamp' in dealing with coins. They are called "Mintmarks" for Morgans, all are on the reverse of the coins. The easy thing to do to see one is, in your search box type in Morgan dollar mintmarks and click on images.
As of 2016, one standard forever stamp costs 49 cents.
dio
The US did not have a non-denominated stamp in 1973. The first one was issued in 1975 for Christmas.
one dollar
Yes, in 2007 a stamp called the 1c Z Grill, it was estimated at $3,000,000!
One 20th of a dollar
George Washington
See link to Australian one-dollar coin
one dollar
On a USA one dollar bill
there aren't