Hello from Halifax, NS, Coinwatcher, welcome to Stamp Community!

Beautiful scans or photos of the stamps.
I particullarily like the colour on the 3c Red it looks like.
Best ro post these pics under a new topic that you start up under Canadian Stamps section, and call it Small Queens something or other to attract the people who know can comment on these for you, and not everyone looks here all the time.
I know just a little myself but love he designs of them.
Cancel looks like an Railway Post Office (EPO) cancels, a 'OSO STATION' type. These have a catalogue all of their own but hopefully someone could help here also.