Nice notes!
The AA prefix was one of the first prefix's printed so these would be some of the earliest notes to be issued into circulation in 1973. I have attached a link with a list of all 2 letter and 3 letter prefixes for the Lawson Bouey signatures. They did 2 letters for quite a while before switching to the 3 letter format.
https://www.coinsandcanada.com/bank...75&id_cat=17
The AA prefix was one of the first prefix's printed so these would be some of the earliest notes to be issued into circulation in 1973. I have attached a link with a list of all 2 letter and 3 letter prefixes for the Lawson Bouey signatures. They did 2 letters for quite a while before switching to the 3 letter format.
https://www.coinsandcanada.com/bank...75&id_cat=17



















