The Canadian 'Yale I' were in fact 119 French ordered NA.64 that were diverted to the RCAF,
they were taken on strength between 23 August and 27 September, 1940.
NAA 64.P2 was the French Air Force designation with the P2 (perfectionment two-seater) indicating that
they were intended as advanced trainers.
BTW The earlier NA-57 are referred to in NAA records as NA-57(BT-9B), which indicates a direct relationship
to the USAAC BT-9B rather than the root NA-16 design.
Dunno where RS get that NAA 61 designation on the one marking sheet, the NA-61 (NA-16-1E) was an RCAF
order, the aircraft were later retroactively designated Harvard Mk. I, even though they were not related to the
original British NA-49 Harvard Mk.I order.
-info from North American's T-6, Dan Hagedorn, Specialty Press 2009.