Thanks for your informative first posts.
I have couple of queries though.
You mentioned that
One fact is the 1207 was not the first stamp to be printed on the giori press. The first stamp was the 1193 4c stamp.
I believe that the first Giori printed stamp was Scott 1094 Old Glory
issued July 4, 1957
The Project Mercury Scott 1193 was issued on February 20, 1962
which was the same day that John Glenn orbited the Earth in his Mercury spacecraft Friendship 7.
I suppose the printing was done in secret since the Post Office wouldnt
have issued the stamp if the project had failed.