Date (happened)
between 1 December 1969 and 5 December 1969
(probable)
Neville says the two experiences came to him 'this past week'; the first letter was dated December 1, while the lecture was delivered December 5, 1969.
Told / reported
5 December 1969
The passage belongs to lecture 1739, whose delivery is confirmed as 1969-12-05.