Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | Broadcast date | Run time | Viewers (in millions) | Archive |
| --- | --- | --- | --- | --- |
| " A Land of Fear " | 8August1964 | 24:24 | 6.9 | 16mm t/r |
| " Guests of Madame Guillotine " | 15August1964 | 24:04 | 6.9 | 16mm t/r |
| " A Change of Identity " | 22August1964 | 25:23 | 6.9 | 16mm t/r |
| " The Tyrant of France " | 29August1964 | 24:46 | 6.4 | Only stills and/or fragments exist |
| " A Bargain of Necessity " | 5September1964 | 23:51 | 6.9 | Only stills and/or fragments exist |
| " Prisoners of Conciergerie " | 12September1964 | 25:04 | 6.4 | 16mm t/r |
Question:
Name the broadcast date for 6.4 million viewers for the archive of 16mm t/r
Answer:
12September1964