I had a look at some references and I'll take another stab at it.
Unfortunately I can't seem to find my copy of the Fletcher/MacPhail book at the moment so I'll do my best.
For starters, your Harvard was ordered as a NA-76 by the French Armée de l'Air in 1940 as a follow up order to their NA-57 (export BT-9) and NA-64 (upgraded BT-9...some went to Canada as the Yale) orders. The NA-76 was practically identical to the RCAF-ordered NA-66 Harvard Mk II with the main exception being a radio mast ahead of the windscreen.
And when ordered, the aircraft would be referred to by the French as the NA-76, not AT-6A or Harvard.
As a side note, the NA-66, -75, -76, and -81 Harvards used in Canada were basically AT-6A's with extended exhausts for cockpit heating and a fixed rounded rear canopy section. (this is probably where the AT-6A description came from....)
There are a lot of other small changes that Doug (MacHarvard) can go into detail with.
Unfortunately before construction could start on the order (North American was busy building NA-66's at the time) France fell to the Nazis and the entire order was taken over by the RAF.
The 450 aircraft were given serial numbers AJ538-AJ987 and were delivered in between July 1941 and February 1942. Not sure where they crossed the border or if they were flown across or pushed by hand.
A good majority of the NA-76 Harvards were to be used at some of the RAF-operated Service Flying Training Schools (SFTS) in Canada.
The schools flying Harvards were No. 31 SFTS Kingston, Ontario, No. 34 SFTS Medicine Hat, Alberta, No. 37 SFTS Calgary, Alberta, and No. 41 SFTS Weyburn, Saskatchewan.
Most, if not all of the NA-76 Harvards serving in Canada were transferred over to the RCAF around 1943.
Here's a shot of AJ688 as delivered at RAF Picton, Ontario (No 31 Bombing & Gunnery School)
Notice the antenna mast ahead of the windscreen and the landing gear doors fitted. These were usually the first items to be removed as snow could accumulate between the door and tire/strut and sometimes cause the gear to freeze in the up position.

Here's a shot of AJ835 later on in the war at No. 37 SFTS Calgary

And here's a shot of a gaggle of Medicine Hat Harvards (notice the top hat on the white portion of the fin flash)

If you're interested, I can supply the font used for the serial number stencils. It's similar to the USAAF, but not quite.
And as far as I know NAA-built Harvards were probably chromate green (yellow chromate dyed with black ink) but I would love to be proved wrong.
I know for a fact that Noorduyn-built Harvards and any Harvards (and late-war Yales) overhauled by Noorduyn were painted Bronze Green on the insides, so post war AJ832 definitely would have been that colour.
I will also look to see if I can find any postwar photos of '832 for you.