Neville retains the faculty of seeing the cloud around people
Date (happened)
c. 1935
estimated · doubtful · preferred
Why
Onset located on '55th Street', city not stated in this passage; insufficient for a location claim.
Reasoning
The onset ('suddenly it happened, walking down the street') is a punctual event Neville dates to about thirty/thirty-odd years before the telling. Taking the internally-corroborated delivery date 1965-05-07 (probable, chrome header + spring-schedule closing text) over the doubtful catalogue date of 1965-11-22 for the same conflict already documented on this lecture, thirty years back gives circa 1935. The figure is rounded twice over ('about', 'odd'), spoken thirty years after the fact, so confidence stays doubtful even though the delivery-date ceiling is probable.
Told / reported
7 May 1965
estimated · probable
Reasoning
This is when Neville told the audience he still retains the faculty; the telling date is the lecture's delivery date, taken at 1965-05-07 per the same internal-evidence-over-catalogue resolution used for the lecture's other events, capped at the delivery claim's own probable confidence.