Page 103 - Charles Shreve - William H Gross United States 1847 Issue

Section Six: Foreign Mails

A. British North America March 3, 1845-November 15,1847
1. Canada

Cross-border mail rates between the US and Canada were based on the principle of"paid to the lines" until April6, 1851
when a combined or "through" rate of 1W (15~ from California) or 6d. (9d. to California) was introduced. Similar
arrangements for conveying the mails existed between the Maritime Provinces and the US. The rates are explained in
detail at the beginning of Section Five: Used Abroad.

The earliest recorded use of the 1847 issue to Canada

JY 17, 1847 to Belleville, CW via Montreal.
Considered as a single V2 oz. weight rate (10~ < 300 miles) by US post office officials and double
weight rate (1/5V2d. up to 1 oz.) by Canadian post office officials for a distance of 201-300 miles.