Neville begins studying with Abdullah
Date (happened)
1933
stated · probable · preferred
Reasoning
Neville states the year directly and unhedged; confidence is capped at probable because it is a first-person recollection given fifteen years later, with no independent corroboration of the year itself.
Told / reported
1948
estimated
Reasoning
The lecture recounting the Abdullah story is independently corroborated to 1948 by the transcript's own chrome header ('1948 Lesson 3'); the more precise 1948-02-23 catalogue claim (d0) is not used here because it is catalogue backfill only, and the competing 1964-02-03 claim (d1) is refuted and cannot be derived from.