Hello bmackay, welcome to Stamp Community!

The cancels or postmarks are collectible and some of the nicer ones you have there (worth$1 -$2 or more, depending on the whole condition of the stamp and the clarity and readability of the cancel are the CALGARY on the 5c blue Ottawa, the ~~BONNET / MAN. on the 3c purple King George VI, the numbered (POCON cancels) on the $1 and I think $2 stamps.
Some other ones also, but the stamps being stuck in to the manila stock pages makes it hard to see everything clearly.
The better a buyer or collector can see what is offered (if you decide to do that at any time) the better chance of selling them. Also the better described, the better.
CDS (Circular Date Stamp) SON (Socked On the Nose) cancellations are collectible, especially on smaller sized stamps where they are very difficult to find well centered.
Overall, a good collection, accumulation, wih mostly fine to very fine well centered stamps. As mentioned the catalogue values will give you an idea of their alue but the market selling value is less. Considerably less with less well-centered stamps and smudgey cancels, or disurbed gum on Mint (post Office fresh) stamps.
If you decide to stick around here and continue with your stamps interest, and want to sell any of the cancels or postmarks (oh yes, a rolelr TORONTO ON cancel there also) then please remeber my name.
Not allowed to buy / sell at this time yet.