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United States Exchange Office Markings
 
 In 1851, the postal arrangement between the United States and New Brunswick established the following exchange offices:

 

 

Robbinston, Maine - St. Andrews, New Brunswick

Calais, Maine - St. Stephen, New Brunswick

Houlton, Maine - Woodstock, New Brunswick 
The following exchange offices were added in 1853 when US route agents, known as steamboat letter carriers, were authorized to operate to St. John on the Boston to St. John steamboats.
Boston, Massachusetts - St. John, New Brunswick
Eastport, Maine - St. John, New Brunswick
Portland, Maine - St. John, New Brunswick
 The Steamboat Letter Carriers (Route Agents) On Board the steamers used Express Mail route agent markings on loose letters, and bagged mail.
 

Express Mail Route Agent Markings

Boston

Eastport

St. John 

 

Exchange Office Markings Used on Boston to St. John Steamers

U. STATES / C 

 Other Markings
  Markings Used In Multiple Cities
Unofficial Exchange Office
 
New Brunswick Exchange Office Markings
Unlike the United States, New Brunswick used a small number of standardized exchange office markings. 
For many letters to the United States during the pence period, the New Brunswick rate markings serve as a type of exchange office marking as the rate is shown as 10 cents, rather than 6 pence.  The "cents" markings would not have been used on double rate domestic letters, which were assessed the same 6 pence rate of postage.
 
Nova Scotia Exchange Office Marking
 
In 1852, the United States negotiated a modification of the postal arrangement with Nova Scotia to exchange mail between Boston, Massachusetts and Halifax, Nova Scotia, by the steamer Sir John Harvey.  Only three sailings occurred pursuant to the proposed treaty, which was not ratified by the United States.  The Nova Scotia Scroll is the only exchange marking used on treaty rate mail from Nova Scotia.