cover -- 1857 (13 April) large part cover from Toronto to the Cape of Good Hope, sent via closed bag to London (28.4 transit c.d.s.) and forwarded to Dartmouth where the rare "DARTMOUTH PACKET LETTER" (Type P1) c.d.s. was applied in blue, rated "1/7½"

细节
cover -- 1857 (13 April) large part cover from Toronto to the Cape of Good Hope, sent via closed bag to London (28.4 transit c.d.s.) and forwarded to Dartmouth where the rare "DARTMOUTH PACKET LETTER" (Type P1) c.d.s. was applied in blue, rated "1/7½"