BC, AB, SK, MN, and so on...
What started as Upper Canada & Lower Canada changed to Canada West and Canada East, respectively in 1841, when the two merged into the "United Province of Canada." The two parts of the province were called "Canada West" & "Canada East" until Confederation in 1867.
In 1867, they were again divided into Ontario and Quebec. That's the history lesson, Merci Wikipedia..
Now I have 2 dated Large Queens, both from 1869. One has "ONT" while the other still shows C.E.
I suppose the logical explanation is that some post offices kept using their old franking stamps for a few years? Have I struck it rich??

Ah the fun of CDS cancels...
