In 1865, the rate was 3 cents per half ounce. However, there was a special rate for British Columbia and Vancouver Island, which was 10 cents. A 10 cents rate stamp 'could have been used' for make up rates for letters going to Great Britain by packet mail, which had a rate of 15 cents.
I am not certain what the international rates were at that time.
From the US: 2c between adjacent exchange offices at the border 10c for other mail from US to Canada (the 5c surcharge for over 3000 miles ended in 1864) However, there were other rates to the provinces. You would need to be more specific as to where it was from and where it was to if it was going to one of them.
According to Geoffrey Whitworth's book "The First Decimal Issue of Canada", 10 cents was the letter rate to U.S.A. per half ounce (except the west coast; the rate to New Brunswick and Nova Scotia via Portland; to all U.S.A. after July 1864; and to British Columbia and Vancouver after July 1864.
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