Page 99 - Charles Shreve - William H Gross United States 1847 Issue

A. British North America April6, 1851 - June 30, 1851
1. Canada

The only recorded cover mailed kom Canada to overseas using US 1847 stamps
One of two recorded full covers fi-om Canada with the first issue of both countries
One of three covers bearing the first stamps of both countries

MY 4 or 5, 1851 to London, England. e
3d. Canadian postage < 60 miles- 24~ (overpaid 1 ~) US postage rate to England.

Combined use ofthe US 1847 issue and Canadian stamps was valid for only 69 days from April23, 1851
when Canada's first stamp was issued and June 30 when the US 1847 issue was demonetized.