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Here's a very nice little ladies cover from Port Henry (Essex County) to Brooklin, Upper Canada (Canada West). Perhaps the most interesting aspects are the Red PAID and X from Port Henry, signifying the 10c rate to Canada and the Arc and Shield Exchange Marking from Rouse's Point, NY, the exchange post office.
Markings:
Port Henry, NY (Nov. 24)
Rouses Point, NY (Nov. 25)
Montreal, LC (Nov. 25, 1852)
????? (Nov. 26, 1852)
Brooklin, UC (Nov. 28, 1852)
4 days from the US to Canadian destination. Takes at least a week today.