Date (happened)
1 February 1969
(probable)
passage 548287 (lecture nid 1900, delivered 1969-01-31): 'The ad will be in tomorrow's Times...It always comes out on Saturday on the religious page'
Told / reported
31 January 1969
(probable)
delivery claims on lecture nid 1900: [d0] circa 1969 probable; [d1] estimated 1969-01-31 probable (six-years-after-Jan-1963 internal reasoning); [d2] stated/confirmed chrome dateline 1969-01-31, also probable